The Rollball command byte needs to be written last. Otherwise the
controller might access the wrong register or write the wrong value.
Fixes: 1fc19bc06e ("realtek: rtl93xx: mdio-smbus support for clause 45 and Rollball SFPs")
Signed-off-by: Jan Hoffmann <jan@3e8.eu>
Link: https://github.com/openwrt/openwrt/pull/23049
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>