ALSA: Introduce common helper functions for jack-detection control

Now move the helper function for creating and reporting the jack-detection
to the common place.  The driver that needs this functionality should
select CONFIG_SND_KCTL_JACK kconfig.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/Kconfig

@@ -207,6 +207,9 @@ config SND_PCM_XRUN_DEBUG
 config SND_VMASTER
 	bool
 
+config SND_KCTL_JACK
+	bool
+
 config SND_DMA_SGBUF
 	def_bool y
 	depends on X86