[ALSA] oxygen: make line-in switch exclusive

The line input cannot be mixed with the other inputs, so we have to mute
the other input switches when it is selected.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/pci/oxygen/oxygen.h

@@ -18,6 +18,10 @@
 enum {
 	CONTROL_SPDIF_PCM,
 	CONTROL_SPDIF_INPUT_BITS,
+	CONTROL_MIC_CAPTURE_SWITCH,
+	CONTROL_LINE_CAPTURE_SWITCH,
+	CONTROL_CD_CAPTURE_SWITCH,
+	CONTROL_AUX_CAPTURE_SWITCH,
 	CONTROL_COUNT
 };