Add LOCAL_SDK_VERSION in car-stream-ui-lib

The car-stream-ui-lib is using only public API. However it is defined
java:platform which can use internal API, since it is not
defined LOCAL_SDK_VERSION.
So, LOCAL_SDK_VERSION := current is added in car-stream-ui-lib, because
it can be turn into errors when link type check becomes more strict.

Bug: 69899800
Test: mma -j under car-stream-ui-lib dir
Change-Id: Ieafae7e2ff9bf1ce8eb521b51fea41f2df3a929f
diff --git a/car-stream-ui-lib/Android.mk b/car-stream-ui-lib/Android.mk
index 2fb2a97..63fd61e 100644
--- a/car-stream-ui-lib/Android.mk
+++ b/car-stream-ui-lib/Android.mk
@@ -39,5 +39,6 @@
         --extra-packages android.support.v7.recyclerview
 
 LOCAL_PROGUARD_ENABLED := disabled
+LOCAL_SDK_VERSION := current
 
 include $(BUILD_STATIC_JAVA_LIBRARY)