ALSA: hda - disable amp override on non-HP machines

Some machines with Cx5045 seem to have no problem with the volume
over 0dB on NID 0x17.  Disable amp overrides for other devices but HP.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>