ALSA: HDA: Remove quirk for Toshiba Qosmio G50

The user reports that model=auto works better than current handling
on a 3.2 based kernel (with jack detection patches backported).
Since model=auto is what we prefer these days anyway, the quirk
should be removed.

Alsa-info for the relevant machine:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/923316/+attachment/2702812/+files/alsa-info.txt.Pbfno2x7bp

BugLink: https://bugs.launchpad.net/bugs/923316
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>