When the headset was plugged in the Dell desktop, the mic of headset
can't be detected and workable.
According to the alsa-info, we found the differece between alsa and
init_pin_configs on the machine, so we need to add the pin configs to
make headset work.

Codec: Realtek ALC3234
Vendor Id: 0x10ec0255
Subsystem Id: 0x102806bb

BugLink: https://bugs.launchpad.net/bugs/1477900Signed-off-by: Woodrow Shen <woodrow.shen@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>