arm: dts: fsl-ls1088a: syncronise MDIO+PCS U-Boot definitions with Linux

arm: dts: fsl-ls1088a: syncronise MDIO+PCS U-Boot definitions with Linux

Synchronise the MDIO controller definitions with Linux, so
the controllers will be usable when passing U-Boot's
control FDT to Linux.

This also adds the PCS (internal controller) definitions
which are not used by U-Boot.

Caveat: The kernel definition uses "fsl,fman-memac-mdio",
as with other members of the Layerscape family, but
U-Boot uses a different driver for the DPAA2
Family devices (LS1088/LS2088/LX2160). So
we use "fsl,ls-mdio" as the first compatible string
for these devices.

Signed-off-by: Mathew McBride <matt@traverse.com.au>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com> # on LS1088A-RDB