When resume phy, it need about 1.5 ~ 2ms to wait for
utmi_clk which used for USB controller to become stable.
Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>