ARM: Clean up some redundancy and fault behavior for unimplemented thumb MCR, MRC.
ARM: Clean up some redundancy and fault behavior for unimplemented thumb MCR, MRC.

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin