ALSA: hda - Add fixup for MacBook Air 6,1 and 6,2 with CS4208 codec

This patch adds the default pin configuration and some init verbs for
setting COEFs, in addition to the correction of input pin AMP caps
for MacBook Air 6,1 and 6,2.  With these changes, the headphone jack
detection starts working properly.

[trivial space fixes by tiwai]

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=60811


Signed-off-by: Ben Whitten <benwhitten@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>