ALSA: hda/realtek - Remove GPIO_MASK

GPIO_MASK was introduced in commit "df694daa [ALSA] hda-codec - Add
the support of ALC262,ALC883,ALC885,ALC861" but it's not being used. So
we can simply remove it.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_realtek.c

@@ -41,9 +41,6 @@
 /* keep halting ALC5505 DSP, for power saving */
 #define HALT_REALTEK_ALC5505
 
-/* for GPIO Poll */
-#define GPIO_MASK	0x03
-
 /* extra amp-initialization sequence types */
 enum {
 	ALC_INIT_NONE,