This reverts commit f2624791.

Łukasz Wojniłowicz reported that the change causes both internal and
external mics not working any more.  The headphone jacking issue was
fixed by his previous patch, it's better to revert to acer-aspire-4930g
model.
Reported-by: Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>