Set apex_available property

The marked library(ies) were available to the APEXes via the
hand-written whitelist in build/soong/apex/apex.go. Trying to remove the
whitelist by adding apex_available property to the Android.bp of the
libraries.

Bug: 150999716
Test: m
Change-Id: Id9f934640b30527cec7b5cc4c180a04c4aeffb40
diff --git a/Android.bp b/Android.bp
index cbc268c..7c7ba25 100644
--- a/Android.bp
+++ b/Android.bp
@@ -53,6 +53,11 @@
             enabled: true,
         },
     },
+    apex_available: [
+       "//apex_available:platform",
+       "com.android.adbd",
+       "com.android.media.swcodec",
+    ],
 }
 
 cc_binary {