wusb: add the Wireless USB core (build-system)

Add the WUSB build system (Kconfig and Kbuild) files.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: David Vrabel <david.vrabel@csr.com>
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index bcefbdd..c23a985 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -97,6 +97,8 @@
 
 source "drivers/usb/mon/Kconfig"
 
+source "drivers/usb/wusbcore/Kconfig"
+
 source "drivers/usb/host/Kconfig"
 
 source "drivers/usb/musb/Kconfig"