Disable verity on -eng builds

Verity is counter to the goal of -eng builds, so disable it on -eng
builds.

Change-Id: I9f9851d14948be04834394dc5e5445a36aafa945
Merged-In: I9f9851d14948be04834394dc5e5445a36aafa945
Fixes: 64315394
Test: verified -eng doesn't have verity enabled, but -userdebug does
diff --git a/core/Makefile b/core/Makefile
index fc724ea..a7fd73c 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2278,6 +2278,10 @@
 BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS += --rollback_index $(BOARD_AVB_ROLLBACK_INDEX)
 endif
 
+ifeq (eng,$(filter eng, $(TARGET_BUILD_VARIANT)))
+BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS += --set_hashtree_disabled_flag
+endif
+
 ifndef BOARD_BOOTIMAGE_PARTITION_SIZE
   $(error BOARD_BOOTIMAGE_PARTITION_SIZE must be set for BOARD_AVB_ENABLE)
 endif