Limit build visibility of modules in apex/...

This changes the default visibility of soong modules in this directory
to __subpackages__, from the current public default.

This helps accidental dependencies sneaking in without intent from
the module owner.

Bug: 175604587
Test: m nothing
Change-Id: I1df8b8e087d27f62ce8c09d7e6e32d511efdba6b
diff --git a/apex/media/framework/Android.bp b/apex/media/framework/Android.bp
index b3c9a9a..811a700 100644
--- a/apex/media/framework/Android.bp
+++ b/apex/media/framework/Android.bp
@@ -48,6 +48,10 @@
         "test_com.android.media",
     ],
     min_sdk_version: "29",
+    visibility: [
+        "//frameworks/av/apex:__subpackages__",
+        "//frameworks/base", // For framework-all
+    ],
 }
 
 filegroup {
@@ -58,6 +62,7 @@
         ":mediaparser-srcs",
         ":mediasession2-java-srcs",
     ],
+    visibility: ["//frameworks/base"],
 }
 
 filegroup {