Limit visibility of libmediametrics.so

Test: build
Bug: 138219814
Change-Id: I63a93d4d13e63ff364e9d5ca4a53316bd9770663
diff --git a/media/libmediametrics/Android.bp b/media/libmediametrics/Android.bp
index 50f18f4..9d348ec 100644
--- a/media/libmediametrics/Android.bp
+++ b/media/libmediametrics/Android.bp
@@ -42,6 +42,10 @@
         enabled: true,
         symbol_file: "libmediametrics.map.txt",
     },
+
+    visibility: [
+        "//frameworks/av:__subpackages__",
+        "//frameworks/base/core/jni",
+        "//frameworks/base/media/jni",
+    ],
 }
-
-