ALSA: hda - Add lifebook model for Realtek ALC269

The widget layout of the Fujitsu Lifebook S6420 (which is ICH9M-based
and uses an ALC269) is similar but not identical to the Lifebook
S6410/E8410 (which are ICH8M-based and use an ALC262).

It is named lifebook as fujitsu is in use for Amilo machines. This builds
on the Quanta FL1 work and supports all analog inputs & outputs that I am
aware of.  Microphone autoswitch is implemented. The laptop mic port takes
precedence over the dock mic port if both happen to have a jack plugged in.
This made sense to me as a design decision (imagine a presentation
environment with the dock fully wired in and the presenter quickly wanting
to override the mic with a headset).

There is mention of a digital audio path on the codec graph, so perhaps
the headphone socket is dual-function analog/digital. I will follow up
with another patch if I can acquire equipment to test this.

Signed-off-by: Tony Vroon <tony@linx.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>