Reland "mark platform un-availability""

This reverts commit 6e1fa4452b933b103145f5b3128356ff96dd7c1a.

Reason for revert: relanding a reverted changed

Bug: 153073816
Change-Id: I3735866776cf6eb0320c9fb8c6be8ac0c48baa1c
Test: m
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index e2bdb37..5af0570 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -192,6 +192,7 @@
 LOCAL_NOSANITIZE:=
 LOCAL_NO_STANDARD_LIBRARIES:=
 LOCAL_NO_STATIC_ANALYZER:=
+LOCAL_NOT_AVAILABLE_FOR_PLATFORM:=
 LOCAL_NOTICE_FILE:=
 LOCAL_ODM_MODULE:=
 LOCAL_OEM_MODULE:=