ARM: sun8i: r40: enable USB host for Banana Pi M2 Ultra

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>