Move the app to /system_ext

We plan to forbid hidden API in product partition.
So these apps have to be moved to /system_ext because it uses hidden API.
It is not permanent, so they can be moved back to /product due to
needs if there isn't hidden usage anymore.

Bug: 137908189
Test: m
Test: check whether device boots successfully
Change-Id: I0662674a66bc54ee4713e5c7ed6ad0db4d342338

packages/WAPPushManager/Android.bp

@@ -10,5 +10,5 @@ android_app {
         proguard_flags_files: ["proguard.flags"],
     },
 
-    product_specific: true,
+    system_ext_specific: true,
 }

packages/WAPPushManager/CleanSpec.mk

@@ -49,3 +49,5 @@
 # ************************************************
 
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/WAPPushManager)
+$(call add-clean-step, rm -rf $(TARGET_OUT_PRODUCT)/app/WAPPushManager)
+

packages/WallpaperCropper/Android.bp

@@ -3,7 +3,7 @@ android_app {
     srcs: ["src/**/*.java"],
     platform_apis: true,
     certificate: "platform",
-    product_specific: true,
+    system_ext_specific: true,
     privileged: true,
     optimize: {
         proguard_flags_files: ["proguard.flags"],

packages/WallpaperCropper/CleanSpec.mk

@@ -44,6 +44,7 @@
 #$(call add-clean-step, find $(OUT_DIR) -type f -name "IGTalkSession*" -print0 | xargs -0 rm -f)
 #$(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/WallpaperCropper)
+$(call add-clean-step, rm -rf $(TARGET_OUT_PRODUCT)/priv-app/WallpaperCropper)
 
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST