feat(mediatek): add SMC handler for EMI MPU

EMI MPU will handle the SMC call from optee, so we need to add this
patch to support it.

Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.com>
Signed-off-by: jason-ch chen <Jason-ch.Chen@mediatek.com>
Change-Id: I22e128c4246814cbd5855f51a26e4e11ccfe3a6b