ALSA: hda/realtek: Fix silent speaker on Higole F9B

The Higole F9B is an Alder Lake-N mini PC with a 7" touchscreen and an
ALC269VC codec (subsystem ID 0x10ec111e). Its DMI strings are all
"Default string", so the SSID is the only way to identify it.

The internal speaker is silent out of the box. The generic parser
assigns DAC 0x03 to the speaker pin 0x14 and DAC 0x02 to the headphone
pin 0x15, but the speaker only reproduces what DAC 0x02 plays, whatever
its connection selection says. Checked one path at a time, only the
gain of DAC 0x02 and the mute of pin 0x14 change what comes out of the
speaker. User space only knows the path it was told the speaker uses,
so selecting the speaker turns the path that actually reaches it all
the way down.

Route both 0x14 and 0x15 through mixer 0x0c (DAC 0x02), which is what
ALC290_FIXUP_MONO_SPEAKERS already does. Tested on the device: the
speaker plays.

Cc: <stable@vger.kernel.org>
Assisted-by: LLM
Signed-off-by: Yu-Hsiang Tseng <asas1asas200@gmail.com>
Link: https://patch.msgid.link/20260923141344.1543158-1-asas1asas200@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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