ath79: mikrotik: swap RB922UAGS-5HPaCD eth0/1 MACs

ath79: mikrotik: swap RB922UAGS-5HPaCD eth0/1 MACs

Since support for SFP on the MikroTik RouterBOARD 922UAGS-5HPacD was
added by 4387fe00cb, the MAC addresses for eth0 (Ethernet) and eth1
(SFP) were swapped. This patch fixes the 02_network script to assign MAC
addresses correctly, so they match the label and the vendor's OS.

Tested on a RouterBOARD 922UAGS-5HPacD board.

Signed-off-by: Roger Pueyo Centelles <roger.pueyo@guifi.net>
(cherry picked from commit 14a95b36b1ecd038fffc279878c5a4c51043d709)