This defines the 24bps and 40bps (8khz sample rate) G.723 codec
formats. They are going to be used once I submit the driver for
an mpeg4/g723 compression card.

I've updated the signed value to -1 as per Takashi's comments
since these are non-linear formats.
Signed-off-by: NBen Collins <bcollins@bluecherry.net>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>