ARM: dts: sun7i: bananapi-m1-plus: Enable USB PHY for USB host support

The 2 USB host ports are directly tied to the 2 USB hosts in the SoC.
The 2 host pairs were already enabled, but the USB PHY wasn't.
VBUS on the 2 ports are always on.

Enable the USB PHY.

Fixes: 04c85eca ("ARM: dts: sun7i: Add dts file for Bananapi M1 Plus
		      board")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>