[ALSA] hda-codec - Fix headphone output for some Intel 945 systems

This patch enables headphone output at initialization for Intel
945 based systems that don't have proper detection circuitry.

Signed-off-by: Tobin Davis <tobinx.b.davis@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>