Add a driver for the Motorcomm yt8511 phy that will be used in the
production Pine64 rk3566-quartz64 development board.
It supports gigabit transfer speeds, rgmii, and 125mhz clk output.
Signed-off-by: NPeter Geis <pgwipeout@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>