app: add new shell_overlay.conf

Add overlay to build SOF with Zephyr shell enabled in the build.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

app/shell_overlay.conf

@@ -0,0 +1,14 @@
+CONFIG_SHELL=y
+CONFIG_SHELL_HELP=y
+CONFIG_SHELL_CMDS=y
+CONFIG_SHELL_LOG_BACKEND=n
+CONFIG_SHELL_AUTOSTART=y
+
+CONFIG_SHELL_BACKEND_ADSP_MEMORY_WINDOW=y
+
+# mtrace uses the same window2.1 slot, so needs to be disabled
+CONFIG_LOG_BACKEND_ADSP_MTRACE=n
+
+# as mtrace is disable, enable logging via winstream/window3
+CONFIG_LOG_BACKEND_ADSP=y
+CONFIG_WINSTREAM_CONSOLE=y