Drop platform_apis from android_library

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

Test: m nothing
Bug: 215379393
Change-Id: Icec33b2961d043669e1138c1a3c452b88a43bed2
diff --git a/Android.bp b/Android.bp
index da4dd63..1e358df 100644
--- a/Android.bp
+++ b/Android.bp
@@ -99,8 +99,6 @@
 
     manifest: "AndroidManifest-withoutActivity.xml",
 
-    platform_apis: true,
-
     optimize: {
         enabled: false,
     },
@@ -138,8 +136,6 @@
 
     manifest: "tests/unit/AndroidManifest.xml",
 
-    platform_apis: true,
-
     optimize: {
         enabled: false,
     },