ALSA: sound/usb: remove CONFIG_EXPERIMENTAL

This config item has not carried much meaning for a while now and is
almost always enabled by default. As agreed during the Linux kernel
summit, remove it.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/Kconfig

@@ -90,7 +90,7 @@ config SND_USB_CAIAQ_INPUT
 
 config SND_USB_US122L
 	tristate "Tascam US-122L USB driver"
-	depends on X86 && EXPERIMENTAL
+	depends on X86
 	select SND_HWDEP
 	select SND_RAWMIDI
 	help