clk: axi-clkgen: replace ARCH dependencies with driver deps

The intent is to be able to run this driver to access the IP core in setups
where FPGA board is also connected via a PCIe bus. In such cases the number
of combinations explodes, where the host system can be an x86 with Xilinx
Zynq/ZynqMP/Microblaze board connected via PCIe.
Or even a ZynqMP board with a ZynqMP/Zynq/Microblaze connected via PCIe.

To accommodate for these cases, this change removes the limitation for this
driver to be compilable only on Zynq/Microblaze architectures.
And adds dependencies on the mechanisms required by the driver to work (OF
and HAS_IOMEM).

Signed-off-by: Dragos Bogdan <[email protected]>
Signed-off-by: Alexandru Ardelean <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Michal Simek <[email protected]>
Reviewed-by: Moritz Fischer <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

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