[ALSA] ice1712 - Fix hoontech MIDI input

Fixes the problems with Midi In on Hoontech/STA dsp24 cards, for example with
DSP2000 box, without restricting the box configurations available.  Also adds
mpu_401 name strings.

Signed-off-by: Alan Horstmann <gineera@aspect135.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>