Added the new fields to contain all input-pins to struct auto_pin_cfg.
Unlike the existing input_pins[], this array contains all input pins
even if the multiple pins are assigned for a single role (i.e. two
front mics).  The former input_pins[] still remains for a while, but
will be removed in near future.
Signed-off-by: Takashi Iwai <tiwai@suse.de>