net: dsa: b53: remove unnecessary spi_set_drvdata()

Remove unnecessary spi_set_drvdata() in b53_spi_remove(), the
driver_data will be set to NULL in device_unbind_cleanup() after
calling ->remove().

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220705131733.351962-1-yangyingliang@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>