pcm: Define refine mask bits explicitly (and fix missing DSD support)

Instead of the expanded bit numbers like 0x81ffffff, list up the all
supported PCM bits explicitly for refine_masks[] in pcm_params.c.
This makes easier to update any additional formats or other
parameters, and easier to spot out missing ones.

Actually the GSM and DSD formats were missing; with this commit, they
are supported properly now.

Signed-off-by: Takashi Iwai <tiwai@suse.de>