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/environments/sp/sp.ld.S b/environments/sp/sp.ld.S
index ac29bb1..3e0e69e 100644
--- a/environments/sp/sp.ld.S
+++ b/environments/sp/sp.ld.S
@@ -51,6 +51,7 @@
 	.dynstr : { *(.dynstr) }
 	.hash : { *(.hash) }
 	.note.gnu.build-id : { *(.note.gnu.build-id) }
+	.note.gnu.property : { *(.note.gnu.property) }
 
 	. = ALIGN(8);
 	__rela_start = .;