ALSA: hda/realtek: Fix headset mic on Legion AW88399 laptops

The ALC287 codec on Lenovo Legion AW88399 laptops does not mark
the combo-jack microphone as a headset mic, so the HDA parser
treats it as a plain microphone. The headset microphone route
and inline headset buttons are therefore unavailable.

Enable Realtek headset mode without treating the jack as a
headphone microphone, and enable headset jack button handling.
Suppress automatic microphone selection so the internal microphone
remains selectable while a headset is connected.

The existing 0x1d override is redundant: firmware already marks
that pin unused, and the override triggers a "SKU not ready
0x411111f0" warning. Drop it.

Signed-off-by: Aaron Ma <mapengyu@gmail.com>
Reviewed-by: Marco Giunta <marco_giunta@outlook.it>
Tested-by: Marco Giunta <marco_giunta@outlook.it>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20260804185325.22861-1-mapengyu@gmail.com