[fix/ml-svc-model] fix the rpk example

- fix ml-svc-model/mobilenetv3-rpk
- the name and format of json file are modified.
  (model_description.json -> rpk_config.json)
- add metadata mlops key in tizen-manifest.xml

Signed-off-by: Suyeon Kim <suyeon5.kim@samsung.com>

Tizen.native/ml-svc-model/README.md

@@ -14,7 +14,7 @@
 
 ### Scenario using [Tizen Resource Package](https://docs.tizen.org/application/tizen-studio/native-tools/rpk-package/)
 
-1. When the org.resource.mobilenetv3 tizen resource package (rpk) is installed, a daemon running in the Tizen device registers model files based on the provided "model_description.json"
+1. When the org.resource.mobilenetv3 tizen resource package (rpk) is installed, a daemon running in the Tizen device registers model files based on the provided "rpk_config.json"
 2. Without any change to imgcls app, it uses newly installed model file.
 ![rpk](./mobilenetv3_600.png)
 

Tizen.native/ml-svc-model/mobilenetv3-rpk/res/global/tizen.ai.model/rpk_config.json

@@ -0,0 +1,10 @@
+{
+  "models": [
+    {
+      "name" : "imgcls-mobilenet-224-224-fp",
+      "model" : "lite-model_mobilenet_v3_large_100_224_fp32_1.tflite",
+      "description" : "Image classification model v1.0.0",
+      "activate" : "true"
+    }
+  ]
+}

Tizen.native/ml-svc-model/mobilenetv3-rpk/tizen-manifest.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns="http://tizen.org/ns/packages" api-version="6.5" package="org.resource.mobilenetv3" version="1.0.0" res-type="tizen.ai.model" res-version="1.5.0">
 	<allowed-package id="*"/>
+	<metadata key="http://tizen.org/metadata/mlops" value="SAMPLE"/>
 </manifest>