ALSA: hda/realtek: Fix headset mic on Acer Nitro 5 AN515-46

ALSA: hda/realtek: Fix headset mic on Acer Nitro 5 AN515-46

The Acer Nitro 5 AN515-46 (SSID 1025:159e, Realtek ALC287) has a combo
headset jack whose microphone does not work out of the box: the BIOS
leaves pin 0x19 unconfigured, so no headset mic is created.

Apply ALC2XX_FIXUP_HEADSET_MIC, the same fixup already used by the
sibling models AN515-57 (1025:1539) and AN517-55 (1025:1597), which
makes the headset microphone work correctly.

Tested on an Acer Nitro 5 AN515-46 by overriding the model via a patch
firmware with model=alc2xx-fixup-headset-mic.

Signed-off-by: Marcos Paulo Medeiros <maarcospm1996@gmail.com>
Link: https://patch.msgid.link/20260725214131.25872-1-maarcospm1996@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>