Make @Discouraged visible to libcore/ and art/

This change adds android.annotation.Discouraged to the list of
API annotations from the framework that can be used in libcore/ and
art/.

Bug: 202993567
Test: Check that importing android.annotation.Discouraged does not
      result in a build error when imported in arbitrary java files in
      libcore.
Change-Id: If8ff4fbd13d403d9bb1f10f7d9f98f5782ba4818
1 file changed
tree: 65b50a7c513d6f003ebad2512a22c11f02b9caed
  1. build/
  2. java/
  3. javatests/
  4. tools/
  5. Android.bp
  6. OWNERS
  7. PREUPLOAD.cfg
  8. TEST_MAPPING