FMRadio: Set LOCAL_PRIVATE_PLATFORM_APIS

This change sets LOCAL_SDK_VERSION for all packages where
this is possible without breaking the build, and
LOCAL_PRIVATE_PLATFORM_APIS := true otherwise.

Setting one of these two will be made required soon, and this
is a change in preparation for that. Not setting LOCAL_SDK_VERSION
makes the app implicitly depend on the bootclasspath, which is
often not required. This change effectively makes depending on
private apis opt-in rather than opt-out.

Test: make relevant packages
Bug: 73535841
Change-Id: Ib244e0b7de264191a94d8b0e6512be2a580ec59f
diff --git a/Android.mk b/Android.mk
index 1fc1a34..a04ca4f 100644
--- a/Android.mk
+++ b/Android.mk
@@ -28,6 +28,9 @@
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 
 LOCAL_PACKAGE_NAME := FMRadio
+
+LOCAL_PRIVATE_PLATFORM_APIS := true
+
 LOCAL_JNI_SHARED_LIBRARIES := libfmjni
 
 LOCAL_PROGUARD_ENABLED := disabled