Modules: HDA Codec driver

This patch is janitorial - it cleans up a number of cosmetic issues with
the 'fujitsu' and 'test' models.  Issues addressed:

 * spaces instead of tabs used for some indents,

 * clarified/corrected selected comments.

Unlike a patch from earlier this week, this keeps both ADCs connected to
the mic1 pin widget by default.  I believe this is the better default, since
some laptops don't bring the line1 widget to the outside world.  Most (if
not all) do bring mic1 out though, so it seems to me that this default
should remain in place.
Signed-off-by: NTakashi Iwai <tiwai@suse.de>