fix(mte): use ATA bit with FEAT_MTE2

Currently SCR_EL3.ATA bit(26) is used freely or either with FEAT_MTE,
But ATA bit is available only with FEAT_MTE2. So use FEAT_MTE2
conditional check for use of SCR_EL3.ATA.

Ref:
https://developer.arm.com/documentation/ddi0601/2023-12/AArch64-Registers/SCR-EL3--Secure-Configuration-Register?lang=en#fieldset_0-26_26-1

Change-Id: I0a5766a138b0be760c5584014f1ab817e4207a93
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
1 file changed