Enable dm-verity

Change-Id: Ic71e510c03183c80adad057e82bfc41903a807f8
diff --git a/device.mk b/device.mk
index 353ddbd..7adce18 100644
--- a/device.mk
+++ b/device.mk
@@ -237,6 +237,10 @@
     device/lge/bullhead/init.bullhead.diag.rc.user:root/init.bullhead.diag.rc
 endif
 
+# setup dm-verity configs.
+PRODUCT_SYSTEM_VERITY_PARTITION := /dev/block/platform/msm_sdcc.1/by-name/system
+$(call inherit-product, build/target/product/verity.mk)
+
 # setup dalvik vm configs.
 $(call inherit-product, frameworks/native/build/phone-xhdpi-2048-dalvik-heap.mk)