The new device trees use a more generic interface for
supporting muxing mdio buses. The mux property is thus
specified in "reg", rather than "fsl,hydra-mdio-muxval".
In order to support using old device trees, we keep the
old fixup in there. Linux will therefore see the both
properties, but will ignore fsl,hydra-mdio-muxval.
Signed-off-by: Chunhe Lan <Chunhe.Lan@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com>