packages/services/Telephony: 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: I8bd54cfb775334dfa01b9adcd6ff198296ba160d
diff --git a/tests/Android.mk b/tests/Android.mk
index b43533f..a6a79fe 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -21,6 +21,7 @@
 
 LOCAL_JAVA_LIBRARIES := android.test.runner
 LOCAL_PACKAGE_NAME := TeleServiceTests
+LOCAL_PRIVATE_PLATFORM_APIS := true
 LOCAL_CERTIFICATE := platform
 
 LOCAL_MODULE_TAGS := tests