staging: greybus: gbphy: make gbphy_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the gbphy_bus_type variable to be a constant structure as well,
placing it into read-only memory which can not be modified at runtime.

Cc: Alex Elder <[email protected]>
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Johan Hovold <[email protected]>
Link: https://lore.kernel.org/r/2024010508-fossil-glove-c2c6@gregkh
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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