Drop platform_apis from android_library

This property is a no-op for this module type.

Test: m nothing
Bug: 215379393
Change-Id: If8c70ac9aa7961c3f0d12dba0bd5c70143a8fa49
diff --git a/Android.bp b/Android.bp
index 393ad00..856eec1 100644
--- a/Android.bp
+++ b/Android.bp
@@ -81,8 +81,6 @@
         "res",
     ],
 
-    platform_apis: true,
-
     optimize: {
         enabled: false,
     },