usb: Make USB_MUSB_PIO_ONLY selected by USB_MUSB_SUNXI

This ensures the USB_MUSB_PIO_ONLY config is set to an apppropriate
value from the changes enabling USB_MUSB_GADGET does.

Namely, USB_MUSB_PIO_ONLY default to =y on USB_MUSB_SUNXI being y.

Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>

drivers/usb/musb-new/Kconfig

@@ -68,6 +68,7 @@ config USB_MUSB_PIC32
 config USB_MUSB_SUNXI
 	bool "Enable sunxi OTG / DRC USB controller"
 	depends on ARCH_SUNXI
+	select USB_MUSB_PIO_ONLY
 	default y
 	---help---
 	Say y here to enable support for the sunxi OTG / DRC USB controller