packages/apps/SafetyRegulatoryInfo: 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: Ia9fae463164dc2b25be5076c2a2a916d76de694a
diff --git a/Android.mk b/Android.mk
index 96eb039..fd9aaa8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -8,5 +8,6 @@
 LOCAL_PROGUARD_ENABLED := disabled
 
 LOCAL_PACKAGE_NAME := SafetyRegulatoryInfo
+LOCAL_SDK_VERSION := current
 
 include $(BUILD_PACKAGE)