Fix typo PRODUCT_VERITY_PARTITION -> PRODUCT_SYSTEM_VERITY_PARTITION

Bug: 16042613
Change-Id: I4ad05cf2408c84f6ca4f19e9babf44b6af948394
diff --git a/device.mk b/device.mk
index a0c2ace..c5a8664 100644
--- a/device.mk
+++ b/device.mk
@@ -298,7 +298,7 @@
 $(call inherit-product-if-exists, vendor/qcom/gpu/msm8x84/msm8x84-gpu-vendor.mk)
 
 # setup dm-verity configs.
-PRODUCT_VERITY_PARTITION=/dev/block/platform/msm_sdcc.1/by-name/system
+PRODUCT_SYSTEM_VERITY_PARTITION := /dev/block/platform/msm_sdcc.1/by-name/system
 $(call inherit-product, build/target/product/verity.mk)
 
 # setup scheduler tunable