platform/surface: aggregator: make ssam_bus_type constant and static

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

It's also never used outside of
drivers/platform/surface/aggregator/bus.c so make it static and don't
export it as no one is using it.

Cc: Maximilian Luz <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: Ilpo Järvinen <[email protected]>
Cc:  <[email protected]>
Reviewed-by: Maximilian Luz <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Link: https://lore.kernel.org/r/2023121957-tapered-upswing-8326@gregkh
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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