* mt-tdep.c (mt_register_name): Correct out-of-range logic to

	* mt-tdep.c (mt_register_name): Correct out-of-range logic to
	include additional registers.

	* mt-tdep.c (mt_gdb_regnums): Add ZI2, ZQ2, Ichannel2,
	Iscramb2, Qscramb2, Qchannel2.
	(mt_register_name): Likewise.
	(mt_copro_register_type): Describe ZI2 and ZQ2.

	* mt-tdep.c (mt_gdb_regnums): Define
	MT_COPRO_PSEUDOREG_MAC_REGNUM.
	(mt_register_name): Use it.
	(mt_copro_register_type): Likewise.
	(mt_register_type): Likewise.
	(mt_pseudo_register_read): Likewise.  Read the MAC register, not
	the coprocessor register.
	(mt_pseudo_register_write): Likewise.