Convert libmedia_jni to Android.bp

See build/soong/README.md for more information.

Test: m -j checkbuild
Change-Id: I1817c75ee45537ca0d5fc40a035f94a3dfeccc11
Merged-In: I1817c75ee45537ca0d5fc40a035f94a3dfeccc11
(cherry picked from commit 76de4f6b4d09423b3a5d3603527ce79acae4ed32)
15 files changed