feat(mec): add helper to detect FEAT_MEC presence

This patch add a helper so it can be used to detect the presence
of FEAT_MEC. It will be used in further patches.

Change-Id: I8faae3a99208434f85f189a75117b59cb4e6aa2f
Signed-off-by: Tushar Khandelwal <tushar.khandelwal@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: Juan Pablo Conde <juanpablo.conde@arm.com>
2 files changed