uwb: depend on EXPERIMENTAL

The UWB stack has some sysfs APIs that will change thus it's best
marked as EXPERIMENTAL until these APIs are finalized.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
diff --git a/drivers/uwb/Kconfig b/drivers/uwb/Kconfig
index 317e9fe..ca78312 100644
--- a/drivers/uwb/Kconfig
+++ b/drivers/uwb/Kconfig
@@ -3,7 +3,8 @@
 #
 
 menuconfig UWB
-	tristate "Ultra Wide Band devices"
+	tristate "Ultra Wideband devices (EXPERIMENTAL)"
+	depends on EXPERIMENTAL
 	depends on PCI
 	default n
 	help