ALSA: hda/realtek: fix mute/micmute LEDs for HP ProBook 445 G7

The HP ProBook 445 G7 (17T32ES) uses ALC236. Like ALC236_FIXUP_HP_GPIO_LED,
COEF index 0x34 bit 5 is used to control the playback mute LED, but the
microphone mute LED is controlled using pin VREF instead of a COEF index.

AlsaInfo: https://alsa-project.org/db/?f=0d3f4d1af39cc359f9fea9b550727ee87e5cf45a
Signed-off-by: Jonas Witschel <diabonas@archlinux.org>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210416105852.52588-1-diabonas@archlinux.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>