Use TARGET_OUT instead of TARGET_OUT_SYSTEM

Summary: There is a bug in aosp source which  tries to use a variable TARGET_OUT_SYSTEM that never gets defined anywhere else. This patches to use TARGET_OUT which maps to the path $(PRODUCT_OUT)/system.

Test: Successful Build on master branch

Change-Id: I89296b8df0a68258337db8fd6fa8a6c9d43f7af1
Signed-off-by: Abdelrahman Daim <adaim@meta.com>