Revert "Revert "ramips: mt7620: fix patching mac address in caldata""

Revert "Revert "ramips: mt7620: fix patching mac address in caldata""

This reverts commit f628467dfd6b32ead172d33a2593f04901395343.

The initial fix was correct. However, a recently introduced bug in
base-files can cause some unexpected byte overwriting in eeprom.
Since it has been fixed, let's accept this patch again.

Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/17892
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 43bc5e6e122b06eb9bfd22cf0bdf3212b84073f3)