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/testapps/ImsTestService/Android.mk b/testapps/ImsTestService/Android.mk
index 6afb3d5..29df224 100644
--- a/testapps/ImsTestService/Android.mk
+++ b/testapps/ImsTestService/Android.mk
@@ -19,6 +19,7 @@
 LOCAL_RESOURCE_DIR := $(addprefix $(LOCAL_PATH)/, $(res_dirs))
 
 LOCAL_PACKAGE_NAME := ImsTestApp
+LOCAL_PRIVATE_PLATFORM_APIS := true
 
 LOCAL_CERTIFICATE := platform
 LOCAL_PRIVILEGED_MODULE := true