dt-bindings: net: add st,stlc4560/p54spi binding

The SPI version of Prism54 was sold under a couple of different
names and supported by the Linux p54spi driver, but there was
never a DT binding for it.

Document the four known names of this device and the properties
that are sufficient for its use on the Nokia N8x0 tablet.

As I don't have this hardware or documentation for it, this is
purely based on existing usage in the driver.

Link: https://lore.kernel.org/all/e8dc9acb-6f85-e0a9-a145-d101ca6da201@gmail.com/
Acked-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260507212451.3333185-2-arnd@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

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