ARM: dts: rockchip: Hook resets up to USB PHYs on rk3288.

Let's hook up the resets to the three USB PHYs on rk3288 as per the
bindings.  This is in preparation for a future patch that will set the
"snps,reset-phy-on-wake" on the host port.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>