ALSA: hda_intel: activate COMBO mode for Intel client chipsets

This patch activates the COMBO position_fix for recent Intel client chipsets.
COMBO mode is the recommended setting for Intel chipsets and eliminates HD
audio warnings in dmesg.  This patch has been tested on Lynx Point, Panther
Point, and Cougar Pont.

Signed-off-by: Seth Heasley <seth.heasley@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>