ALSA: hda - Clean up Realtek auto-mute unsol routines
Most of unsol handlers defined in patch_realtek.c can be classified to
two types, mute via amp of pins and mute via ctl bits of pins.
Thus there are a big room to generalize each implementation.
This patch creates two generic functions, alc_automute_amp() and
alc_automute_pin(). The latter is actually changed from the previous
alc_sku_automute(). Each caller needs to initialize hp_pins and
speaker_pins properly at own init_hook.
Signed-off-by: Takashi Iwai <tiwai@suse.de>