Add support for the mdio mux and internal phy glue of the GXL SoC
family
Reported-by: NDa Xue <da@lessconfused.com>
Signed-off-by: NJerome Brunet <jbrunet@baylibre.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>