Remove unnecessary exports from various libraries

This reduces library size by about 10-15%

Test: build, run CTS
Change-Id: I9ecb3f08a8bd6128e601656125e3523c0c52ddb6
diff --git a/media/libmedia/Android.bp b/media/libmedia/Android.bp
index e7dc0fe..fd7400a 100644
--- a/media/libmedia/Android.bp
+++ b/media/libmedia/Android.bp
@@ -235,6 +235,8 @@
         "-Wall",
     ],
 
+    version_script: "exports.lds",
+
     sanitize: {
         misc_undefined: [
             "unsigned-integer-overflow",