ALSA: line6: snd-usb-line6 depends on CONFIG_SND_HWDEP

ERROR: "snd_hwdep_new" [sound/usb/line6/snd-usb-line6.ko] undefined!
scripts/Makefile.modpost:91: recipe for target '__modpost' failed
make[1]: *** [__modpost] Error 1

Fixes: a16039cbf1a1 ('ALSA: line6: Add hwdep interface to access the POD control messages')
Signed-off-by: Valdis Kletnieks <[e-mail]>
Reviewed-by: Takashi Sakamoto <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

sound/usb/line6/Kconfig

···
 	tristate
 	select SND_RAWMIDI
 	select SND_PCM
+	select SND_HWDEP
 
 config SND_USB_POD
 	tristate "Line 6 POD USB support"