Please note build option `ENABLE_FEAT_MTE` is now depcreated[1] and not handled 

anymore part of TF-A since there is no setting needed in EL3 to enable MTE to be

used at EL0. However please note MTE at EL2/EL1 will require setting of

ENABLE_FEAT_MTE2 build option[2].

This is also a breaking change for platforms and downstream code that uses

MTE at EL2/EL1 without any configuration from TF-A but now SCR_EL3.ATA bit(26) 

which was set unconditionally prior to this change[3] is now fixed and moved

correctly under ENABLE_FEAT_MTE2[3].

Going forward use build option `ENABLE_FEAT_MTE2` to use MTE at EL2/EL1.

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Thanks,

Govindraj R