ALSA: hda - Fix capture on Sony VAIO with single input

Sony VAIO VGN-P11G with ALC262 codec has only one input pin, and the
recording doesn't work with model=auto because ALC262 parser sets the
wrong cap NIDs to choose the route and the default route for the sole
input pin wasn't initialized properly.  This patch solves these issues.

Signed-off-by: Takashi Iwai <tiwai@suse.de>