Add test script to validate USB MSD

Runner/suites/Kernel/Baseport/USB/usb_msd/README.md

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+```
+Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+SPDX-License-Identifier: BSD-3-Clause
+```
+
+# USB MSD Validation
+
+## Overview
+
+This shell script executes on the DUT (Device-Under-Test) and verifies enumeration of connected USB Mass Storage Devices (MSD).
+
+---
+
+## Setup
+
+- Connect USB MSD peripheral(s) to USB port(s) on DUT.
+- Only applicable for USB ports that support Host Mode functionality. 
+- USB MSD peripherals examples: USB flash drive, external HDD/SSD, etc. 
+
+---
+
+## Usage
+### Instructions:
+1. **Copy the test suite to the target device** using `scp` or any preferred method.
+2. **Navigate to the test directory** on the target device.
+3. **Run the test script** using the test runner or directly.
+
+---
+
+### Quick Example
+```
+cd Runner
+./run-test.sh usb_msd
+```

Runner/suites/Kernel/Baseport/USB/usb_msd/run.sh

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+#!/bin/sh
+
+# Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+# SPDX-License-Identifier: BSD-3-Clause
+# Validate USB Mass Storage device detection
+# Requires at least one USB Mass Storage peripheral (USB flash drive, external HDD/SSD, etc.) connected to a USB Host port.
+
+TESTNAME="usb_msd"
+
+# Robustly find and source init_env
+SCRIPT_DIR="$(
+  cd "$(dirname "$0")" || exit 1
+  pwd
+)"
+
+# Default result file (works even before functestlib is available)
+# shellcheck disable=SC2034
+RES_FILE="$SCRIPT_DIR/${TESTNAME}.res"
+
+INIT_ENV=""
+SEARCH="$SCRIPT_DIR"
+while [ "$SEARCH" != "/" ]; do
+    if [ -f "$SEARCH/init_env" ]; then
+        INIT_ENV="$SEARCH/init_env"
+        break
+    fi
+    SEARCH=$(dirname "$SEARCH")
+done
+
+if [ -z "$INIT_ENV" ]; then
+    echo "[ERROR] Could not find init_env (starting at $SCRIPT_DIR)" >&2
+	echo "$TESTNAME SKIP" >"$RES_FILE" 2>/dev/null || true
+    exit 0
+fi
+
+# Only source if not already loaded (idempotent)
+if [ -z "${__INIT_ENV_LOADED:-}" ]; then
+    # shellcheck disable=SC1090
+    . "$INIT_ENV"
+    __INIT_ENV_LOADED=1
+fi
+# Always source functestlib.sh, using $TOOLS exported by init_env
+# shellcheck disable=SC1090,SC1091
+. "$TOOLS/functestlib.sh"
+
+# Resolve test path and cd (single SKIP/exit path)
+SKIP_REASON=""
+test_path=$(find_test_case_by_name "$TESTNAME")
+if [ -z "$test_path" ] || [ ! -d "$test_path" ]; then
+  SKIP_REASON="$TESTNAME SKIP - test path not found"
+elif ! cd "$test_path"; then
+  SKIP_REASON="$TESTNAME SKIP - cannot cd into $test_path"
+else
+  RES_FILE="$test_path/${TESTNAME}.res"
+fi
+
+if [ -n "$SKIP_REASON" ]; then
+  log_skip "$SKIP_REASON"
+  echo "$TESTNAME SKIP" >"$RES_FILE" 2>/dev/null || true
+  exit 0
+fi
+
+log_info "-----------------------------------------------------------------------------------------"
+log_info "-------------------Starting $TESTNAME Testcase----------------------------"
+log_info "=== Test Initialization ==="
+
+# Check if dependecies are installed, else skip test
+deps_list="grep sed sort wc"
+if ! check_dependencies "$deps_list"; then
+  log_skip "$TESTNAME SKIP - missing dependencies: $deps_list"
+  echo "$TESTNAME SKIP" >"$RES_FILE"
+  exit 0
+fi
+
+# Count uniques devices with bInterfaceClass = 08 (MSD) under /sys/bus/usb/devices
+msd_device_count=0
+log_info "=== USB Mass Storage device Detection ==="
+msd_device_count=$(
+  for f in /sys/bus/usb/devices/*/bInterfaceClass; do
+    [ -r "$f" ] || continue
+    if grep -qx '08' "$f"; then
+      d=${f%/bInterfaceClass}
+      echo "${d##*/}"
+    fi
+  done 2>/dev/null | sed 's/:.*$//' | sort -u | wc -l | tr -d '[:space:]'
+  )
+
+log_info "Number of MSD devices found: $msd_device_count"
+
+if [ "$msd_device_count" -gt 0 ]; then
+    log_pass "$TESTNAME : Test Passed - USB Mass Storage device(s) detected"
+    echo "$TESTNAME PASS" > "$RES_FILE"
+    exit 0
+else
+    log_fail "$TESTNAME : Test Failed - No USB 'Mass Storage Device' found"
+    echo "$TESTNAME FAIL" > "$RES_FILE"
+    exit 0
+fi

Runner/suites/Kernel/Baseport/USB/usb_msd/usb_msd.yaml

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+metadata:
+  name: usb_msd
+  format: "Lava-Test Test Definition 1.0"
+  description: "This shell script executes on the DUT (Device-Under-Test) and verifies enumeration of connected USB Mass Storage Devices (MSD)."
+  os:
+    - linux
+  scope:
+    - functional
+
+run:
+  steps:
+    - REPO_PATH=$PWD
+    - cd Runner/suites/Kernel/Baseport/USB/usb_msd
+    - ./run.sh || true
+    - $REPO_PATH/Runner/utils/send-to-lava.sh usb_msd.res
+