staging: pi433: Rename "pi433_dev" of type "dev_t" to "pi433_devt"

Distinguish struct device type instances from dev_t instances
to enhance readability.

Signed-off-by: Shahar Avidar <ikobh7@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/20240405074000.3481217-5-ikobh7@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>