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/MtpDocumentsProvider/Android.mk

@@ -4,6 +4,7 @@ include $(CLEAR_VARS)
 LOCAL_MODULE_TAGS := optional
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 LOCAL_PACKAGE_NAME := MtpDocumentsProvider
+LOCAL_PRIVATE_PLATFORM_APIS := true
 LOCAL_CERTIFICATE := media
 LOCAL_PRIVILEGED_MODULE := true
 LOCAL_PROGUARD_FLAG_FILES := proguard.flags

packages/MtpDocumentsProvider/perf_tests/Android.mk

@@ -5,6 +5,7 @@ LOCAL_MODULE_TAGS := tests
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 LOCAL_STATIC_JAVA_LIBRARIES := android-support-test
 LOCAL_PACKAGE_NAME := MtpDocumentsProviderPerfTests
+LOCAL_PRIVATE_PLATFORM_APIS := true
 LOCAL_INSTRUMENTATION_FOR := MtpDocumentsProvider
 LOCAL_CERTIFICATE := media
 

packages/MtpDocumentsProvider/tests/Android.mk

@@ -6,6 +6,7 @@ LOCAL_SRC_FILES := $(call all-java-files-under, src)
 LOCAL_JAVA_LIBRARIES := android.test.runner android.test.base android.test.mock
 LOCAL_STATIC_JAVA_LIBRARIES := junit
 LOCAL_PACKAGE_NAME := MtpDocumentsProviderTests
+LOCAL_PRIVATE_PLATFORM_APIS := true
 LOCAL_INSTRUMENTATION_FOR := MtpDocumentsProvider
 LOCAL_CERTIFICATE := media
 LOCAL_COMPATIBILITY_SUITE := device-tests