usb: musb-new: Kconfig support for USB_MUSB_HOST and USB_MUSB_GADGET

Having MUSB_HOST and MUSB_GADGET in Kconfig allows more flexibility with regard
to what Kconfig options to enable, such as USB_STORAGE or USB_KEYBOARD.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index adce3f6..abb06fc 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -49,6 +49,8 @@
 
 source "drivers/usb/host/Kconfig"
 
+source "drivers/usb/musb-new/Kconfig"
+
 source "drivers/usb/emul/Kconfig"
 
 comment "USB peripherals"