Move mediaextractor seccomp policy into apex

Bug: 112767732
Test: build, run
Change-Id: I3d63b6346c1305ba662077eb81b714cbe24ccfb9
Merged-In: I3d63b6346c1305ba662077eb81b714cbe24ccfb9
diff --git a/apex/Android.bp b/apex/Android.bp
index 2cc6fcb..15ff770 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -33,6 +33,9 @@
             ],
         },
     },
+    prebuilts: [
+        "mediaextractor.policy",
+    ],
     key: "com.android.media.key",
     certificate: ":com.android.media.certificate",