w1: make w1_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the w1_bus_type variable to be a constant structure as well,
placing it into read-only memory which can not be modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Link: https://lore.kernel.org/r/20240204-bus_cleanup-w1-v1-1-a0f4c84d7db3@marliere.net


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>