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
diff --git a/tests/TouchLatency/Android.mk b/tests/TouchLatency/Android.mk
index 969283d..2334bd8 100644
--- a/tests/TouchLatency/Android.mk
+++ b/tests/TouchLatency/Android.mk
@@ -15,6 +15,7 @@
     --auto-add-overlay
 
 LOCAL_PACKAGE_NAME := TouchLatency
+LOCAL_SDK_VERSION := current
 
 LOCAL_COMPATIBILITY_SUITE := device-tests