ALSA: hda/realtek: Enable headset Mic on Positivo P15X

Positivo P15X is equipped with ALC269VC, and needs a fix to make
the headset mic to work.
Also must to limits the internal microphone boost.

Signed-off-by: Edson Juliano Drosdeck <edson.drosdeck@gmail.com>
Link: https://patch.msgid.link/20250619191215.17203-1-edson.drosdeck@gmail.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>