ASoC: Add jack types to dt-bindings

Adding the jack type to the dt-bindings directory will allow for device
tree files to specify the type of audio jacks that are present for a
board.
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/dt-bindings/sound/audio-jack-events.h

+#ifndef __AUDIO_JACK_EVENTS_H
+#define __AUDIO_JACK_EVENTS_H
+
+#define JACK_HEADPHONE		1
+#define JACK_MICROPHONE		2
+#define JACK_LINEOUT		3
+#define JACK_LINEIN		4
+
+#endif /* __AUDIO_JACK_EVENTS_H */