board: rockchip: evb_rv1103b: Init usb controller and phy

This patch reset usb controller and resume usb phy to
normal mode, and also set the usb utmi bvalid to high
from grf for usb download mode.

Change-Id: I98c3e44183b2f5b4c11a62246c6dc9530b109963
Signed-off-by: William Wu <william.wu@rock-chips.com>