Added functions to report jack sense.
As CXT5051_PORTB_EVENT has the same value as CONEXANT_MIC_EVENT two input
devices for the microphone will be created if using CXT5051.
Signed-off-by: NUlrich Dangel <uli@spamt.net>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>