hw_mplay: attempt to add support for Monueal Moncaso IR
Based on the modified mplay_init function posted to lirc-list by
"123justme", which reportedly works for his Monueal Moncaso 312 and
another users Moncaso 320. Reworked to clean up formatting and appear as
a separate hardware target, mplay2, instead of screwing with support for
the already supported devices. Hope I got it right...