TFTF: Add ARMv8.5 BTI support in assembler files

This patch adds BTI support in assembler files
which fully correspond to those in TF-A source tree.

Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
Change-Id: Ie6a7b248c967684c6b2b86b915f0499fe095bba3
4 files changed