The USB 3.0 PHY need to config grf when change between USB 2.0 only and USB 2.0/3.0 mode, so we add grf property for u3phy node. Change-Id: I4ff2670d0637e9d0cbae06f5e9efbde9a8513bb3 Signed-off-by: William Wu <wulf@rock-chips.com>