packages/services/Telecomm: 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: I44cbcaef285632fc8471c050e69678eab6f3968f
diff --git a/Android.mk b/Android.mk
index 79ef194..5b483c4 100644
--- a/Android.mk
+++ b/Android.mk
@@ -13,6 +13,7 @@
 LOCAL_PROTO_JAVA_OUTPUT_PARAMS := optional_field_style=accessors
 
 LOCAL_PACKAGE_NAME := Telecom
+LOCAL_PRIVATE_PLATFORM_APIS := true
 
 LOCAL_CERTIFICATE := platform
 LOCAL_PRIVILEGED_MODULE := true