platforms: added TZ_SAVE_KERNEL_HASH build flag to msm8994

This commit allows to save the boot.img hash in the TZ.
This feature is mandatory for QTI enterprise-security syste

Change-Id: I2542b54e508ddd3cdd1411049da8bce95a9b397e
diff --git a/platform/msm8994/rules.mk b/platform/msm8994/rules.mk
index a9fd66f..641e3cd 100644
--- a/platform/msm8994/rules.mk
+++ b/platform/msm8994/rules.mk
@@ -13,6 +13,8 @@
 DEFINES += WITH_CPU_EARLY_INIT=0 WITH_CPU_WARM_BOOT=0 \
 	   MMC_SLOT=$(MMC_SLOT)
 
+DEFINES += TZ_SAVE_KERNEL_HASH
+
 INCLUDES += -I$(LOCAL_DIR)/include -I$(LK_TOP_DIR)/platform/msm_shared/include
 
 DEVS += fbcon