Banana Pi M2 Ultra board features two USB host ports, connected to the
two USB host ports on the SoC.

Add support for them.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>