net: mdio: mscc-miim: add ability to be used in a non-mmio configuration

There are a few Ocelot chips that contain the logic for this bus, but are
controlled externally. Specifically the VSC7511, 7512, 7513, and 7514. In
the externally controlled configurations these registers are not
memory-mapped.

Add support for these non-memory-mapped configurations.

Signed-off-by: Colin Foster <[email protected]>
Reviewed-by: Vladimir Oltean <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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