ALSA: hda - Fix headphone mic input on a few Dell ALC293 machines

These laptops support both headphone, headset and mic modes
for the 3.5mm jack.

Cc: stable@vger.kernel.org
BugLink: https://bugs.launchpad.net/bugs/1526330


Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>