board: evb-rk3399: enable usb 2.0 host vbus power on board_init

rk3399 using one gpio control signal for two usb 2.0 host port,
it's better to enable the power in board file instead of in usb driver.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
1 file changed