net: dsa: b53: remove .owner and .bus fields for driver

Remove .owner and .bus fields since module_spi_driver() is used
which set them automatically.

Generated by: scripts/coccinelle/api/platform_no_drv_owner.cocci

Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>