ALSA: hda/ca0132 - Fix ZxR Headphone gain control get value.

When the ZxR headphone gain control was added, the ca0132_switch_get
function was not updated, which meant that the changes to the control
state were not saved when entering/exiting alsamixer.

Signed-off-by: Connor McAdams <conmanx360@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200803002928.8638-1-conmanx360@gmail.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>