sunxi: usb: USB_MUSB_SUNXI move to musb-new Kconfig

Now that the musb-new driver has a Kconfig, we can move Kconfig options to
enable controllers to it, so that it's easier in e.g. menuconfig.

In addition, this allows declaring support for USB_MUSB_HOST/GADGET in
defconfigs instead of the USB_MUSB_SUNXI controller, that will get selected
automatically when needed.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
diff --git a/drivers/usb/musb-new/Kconfig b/drivers/usb/musb-new/Kconfig
index 34a8474..0082ff8 100644
--- a/drivers/usb/musb-new/Kconfig
+++ b/drivers/usb/musb-new/Kconfig
@@ -12,3 +12,17 @@
 	bool "MUSB gadget mode support"
 	help
 	  Enables the MUSB USB dual-role controller in gadget mode.
+
+if USB_MUSB_HOST || USB_MUSB_GADGET
+
+config USB_MUSB_SUNXI
+	bool "Enable sunxi OTG / DRC USB controller"
+	depends on ARCH_SUNXI
+	default y
+	---help---
+	Say y here to enable support for the sunxi OTG / DRC USB controller
+	used on almost all sunxi boards. Note currently u-boot can only have
+	one usb host controller enabled at a time, so enabling this on boards
+	which also use the ehci host controller will result in build errors.
+
+endif