The HP ZBook 15u G3 has a Conexant CX20724 with mute led on GPIO1 and
mic mute led on GPIO2.
Adding CXT_FIXUP_MUTE_LED_GPIO inspired on patch_realtek's one.
Signed-off-by: NJerónimo Borque <jeronimo@borque.com.ar>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>