Enable PAC and BTI

Change-Id: I59fbc69d12d8507ce9c7085bb4a1bf8fb992e56c
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 9f88fc5..55028b6 100755
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -40,7 +40,7 @@
 
 # Architecture
 TARGET_ARCH := arm64
-TARGET_ARCH_VARIANT := armv8-a
+TARGET_ARCH_VARIANT := armv8-a-branchprot
 TARGET_CPU_ABI := arm64-v8a
 TARGET_CPU_ABI2 :=
 TARGET_CPU_VARIANT := generic