Add support for the Xilinx Zynq-7000 SoC family to this driver. This
includes some SoC-specific register accesses when setting an updated
TX clock divider, also, the device tree binding now supports higher
MDC clock divisor values when the current target SoC is a Zynq rather
than a ZynqMP.
With regards to the use of this driver in a QEMU simulation of the
Zynq-7000, the Kconfig file is modified so that the driver is not
enabled unless QEMU networking is set to Ethernet mode.
Signed-off-by: Immo Birnbaum <Immo.Birnbaum@weidmueller.com>
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