feat(mte): add mte2 to build

Currently mte2 is all wrapped with FEAT_MTE but in below change
https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/26171
we are adding seperation for FEAT_MTE2.

Add FEAT_MTE2 to all SPM builds.

Change-Id: I573ff10ba0dfb224b53f273a82bbecea8b1cd832
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
14 files changed