frameworks/base: Set LOCAL_SDK_VERSION where possible.

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: I4233b9091d9066c4fa69f3d24aaf367ea500f760

packages/WAPPushManager/Android.mk

@@ -9,6 +9,7 @@ LOCAL_MODULE_TAGS := optional
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 
 LOCAL_PACKAGE_NAME := WAPPushManager
+LOCAL_PRIVATE_PLATFORM_APIS := true
 
 LOCAL_JAVA_LIBRARIES += telephony-common
 LOCAL_STATIC_JAVA_LIBRARIES += android-common

packages/WAPPushManager/tests/Android.mk

@@ -32,6 +32,7 @@ LOCAL_SRC_FILES += \
 # automatically get all of its classes loaded into our environment.
 
 LOCAL_PACKAGE_NAME := WAPPushManagerTests
+LOCAL_PRIVATE_PLATFORM_APIS := true
 
 LOCAL_INSTRUMENTATION_FOR := WAPPushManager