edk2: AndroidBoot.mk: Use PRODUCT_* variables directly

Use the PRODUCT_* variables directly instead of deriving the variable
through PRODUCTS macro.

Change-Id: I41e439163c9ec8ea37f0049e131bc64af5d0a764
diff --git a/AndroidBoot.mk b/AndroidBoot.mk
index 9b5214e..5a31380 100644
--- a/AndroidBoot.mk
+++ b/AndroidBoot.mk
@@ -30,7 +30,7 @@
 PREBUILT_PYTHON_PATH=$(ANDROID_TOP)/prebuilts/python/linux-x86/2.7.5/bin/python2
 
 DISABLE_PARALLEL_DOWNLOAD_FLASH := DISABLE_PARALLEL_DOWNLOAD_FLASH=0
-ifeq ($(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VERITY),true)
+ifeq ($(PRODUCT_SUPPORTS_VERITY),true)
 	VERIFIED_BOOT := VERIFIED_BOOT=1
 else
 	VERIFIED_BOOT := VERIFIED_BOOT=0