Add explicit apex_available clauses

So we can delete the list automatically added within the tools.

Bug: 215589022
Test: build (with the implied list removed in work tree)
Change-Id: I7c427215c77995200e0ea60a2d7ab57e8c5b1bb7
diff --git a/headers/Android.bp b/headers/Android.bp
index 7481a23..cb18837 100644
--- a/headers/Android.bp
+++ b/headers/Android.bp
@@ -28,6 +28,11 @@
         "libstagefright_foundation_headers",
     ],
     min_sdk_version: "29",
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.media",
+        "com.android.media.swcodec",
+    ],
 
     host_supported: true,
     target: {