mte: add mte2 to test builds

SCR_EL3.ATA bit setting is now moved under FEAT_MTE2
So enable that for testing MTE features.

Change-Id: If699869bff28347c67085f5f4d7eab04be93064b
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
1 file changed