Convert libmedia_jni to Android.bp

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

Test: m -j checkbuild
Change-Id: I1817c75ee45537ca0d5fc40a035f94a3dfeccc11
diff --git a/Android.bp b/Android.bp
index 5c059b5..33f3213 100644
--- a/Android.bp
+++ b/Android.bp
@@ -53,6 +53,7 @@
 subdirs = [
     "core/jni",
     "libs/*",
+    "media/*",
     "tools/*",
     "native/android",
     "native/graphics/jni",