ALSA: hda - Dynamic detection of dmics/dmuxes/smuxes in stac92hd71bxx

Detect the number of connected ports and number of smuxes dynamically,
looking at pin configs, using new introduced functions
stac92hd71bxx_connected_ports and stac92hd71bxx_connected_smuxes. Also
use proper input mux configuration for 4port and 5port models.

Signed-off-by: Herton Ronaldo Krzesinski <herton@mandriva.com.br>
Signed-off-by: Takashi Iwai <tiwai@suse.de>