ALSA: hda/realtek - Enable internal speaker & headset mic of ASUS UX431FL

Original pin node values of ASUS UX431FL with ALC294:

0x12 0xb7a60140
0x13 0x40000000
0x14 0x90170110
0x15 0x411111f0
0x16 0x411111f0
0x17 0x90170111
0x18 0x411111f0
0x19 0x411111f0
0x1a 0x411111f0
0x1b 0x411111f0
0x1d 0x4066852d
0x1e 0x411111f0
0x1f 0x411111f0
0x21 0x04211020

1. Has duplicated internal speakers (0x14 & 0x17) which makes the output
   route become confused. So, the output volume cannot be changed by
   setting.
2. Misses the headset mic pin node.

This patch disables the confusing speaker (NID 0x14) and enables the
headset mic (NID 0x19).

Link: https://lore.kernel.org/r/20190902100054.6941-1-jian-hong@endlessm.com
Signed-off-by: Jian-Hong Pan <jian-hong@endlessm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>