t-msp430 (MULTILIB_OPTIONS): Add multilibs for the different types of hardware…

t-msp430 (MULTILIB_OPTIONS): Add multilibs for the different types of hardware multiply available on the MSP430.

	* config/msp430/t-msp430 (MULTILIB_OPTIONS): Add multilibs for the
	different types of hardware multiply available on the MSP430.
	(MULTILIB_DIRNAMES): Likewise.
	(MULTILIB_EXCEPTIONS): Add exceptions for incompatible cpus and
	hardware multiply types.
	(MULTILIB_MATCHES): Add matches for known MCU names and hardware
	multiply types.

From-SVN: r223860