ALSA: HDA patch_via.c: Fix inversion of surround and side channels

In the current driver, there is a consistent mistake between the SURROUND and
the SIDE channels.  This patch fixes it.

Signed-off-by: Harald Welte <HaraldWelte@viatech.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>