Add BTI enablement in TS

Add BTI_ENABLED option which enables bti in the sp,
opteesp and arm-linux environments.

Signed-off-by: Gabor Toth <gabor.toth2@arm.com>
Change-Id: I2ed477f52000839c61d4f0631c5fd19465c5b7a3
diff --git a/external/firmware_test_builder/FirmwareTestBuilder.cmake b/external/firmware_test_builder/FirmwareTestBuilder.cmake
index f5450c6..82a8e2a 100644
--- a/external/firmware_test_builder/FirmwareTestBuilder.cmake
+++ b/external/firmware_test_builder/FirmwareTestBuilder.cmake
@@ -8,6 +8,7 @@
 
 set(FIRMWARE_TEST_BUILDER_URL "https://git.trustedfirmware.org/TS/trusted-services.git" CACHE STRING "firmware-test-builder repository URL")
 set(FIRMWARE_TEST_BUILDER_REFSPEC "topics/fwtb" CACHE STRING "firmware-test-builder git refspec")
+set(BTI_ENABLED @BTI_ENABLED@ CACHE BOOL "")
 
 set(GIT_OPTIONS
 	GIT_REPOSITORY ${FIRMWARE_TEST_BUILDER_URL}