net/fsl: Use [acpi|of]_mdiobus_register

commit ef6e458a551fa9c1c6998ec58e2680f565f18563 from
git://source.codeaurora.org/external/qoriq/qoriq-components/linux



Depending on the device node type, call the specific OF or ACPI
mdiobus_register function.

Note: For both ACPI and DT cases, endianness of MDIO controllers
need to be specified using the "little-endian" property.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Acked-by: Grant Likely <grant.likely@arm.com>
(cherry picked from commit f8c0bb8eabc23f6acd22fc6ebce6800b163955f2)
Signed-off-by: Meng Li <Meng.Li@windriver.com>