[PATCH] msacm32: Added converter for ADPCM to PCM 8 bit mono.

[Fabian Maurer]

Hello, and thanks for the feedback.

The code is mostly C&P, so I didn't know if I should reformat it. I'll try to 
merge the two functions and fix the indentation in the process. Just wasn't 
sure if I should touch the working function or rather make a new one for my 
purposes.
 I'll resend the patch when I'm finished and have done the required tests.

Fabian