packages/providers/ContactsProvider: 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: I87fb73d60bba6737a765505800e7a7549b26da66
diff --git a/Android.mk b/Android.mk
index 8233e5b..d31ad73 100644
--- a/Android.mk
+++ b/Android.mk
@@ -20,6 +20,7 @@
 LOCAL_JACK_COVERAGE_INCLUDE_FILTER := com.android.providers.contacts.*
 
 LOCAL_PACKAGE_NAME := ContactsProvider
+LOCAL_PRIVATE_PLATFORM_APIS := true
 LOCAL_CERTIFICATE := shared
 LOCAL_PRIVILEGED_MODULE := true