Revert "Disable BTI for the ARM kernel"

This reverts commit 4d2b9ba991a70099f011e6f63031981422e2c350.

Change-Id: I279d57fa51fb7070bd4453324ddec650ca5e80ed
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/91754
Reviewed-by: Kevin Berry <kpberry@google.com>
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
diff --git a/arch/arm64/configs/lakitu_defconfig b/arch/arm64/configs/lakitu_defconfig
index 00b42ac..66327fe 100644
--- a/arch/arm64/configs/lakitu_defconfig
+++ b/arch/arm64/configs/lakitu_defconfig
@@ -494,7 +494,8 @@
 # ARMv8.5 architectural features
 #
 CONFIG_AS_HAS_ARMV8_5=y
-# CONFIG_ARM64_BTI is not set
+CONFIG_ARM64_BTI=y
+CONFIG_ARM64_BTI_KERNEL=y
 CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI=y
 CONFIG_ARM64_E0PD=y
 CONFIG_ARM64_AS_HAS_MTE=y