Allwinner H3/V3s features a variant of MUSB controller, which lacks one
endpoint.

Add support for it.
Signed-off-by: NIcenowy Zheng <icenowy@aosc.xyz>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
[b-liu@ti.com: added usb: to commit subject prefix]
Signed-off-by: NBin Liu <b-liu@ti.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>