qualcommax: ipq807x: Fix MAC addresses usage for RAX120v2

qualcommax: ipq807x: Fix MAC addresses usage for RAX120v2

Currently, 6 MAC addresses are read from the "boarddata1" partition and set for network interfaces in sequence.
This partition only contains 3 MAC addresses:
1. lan mac
2. wan mac
3. wlan5g mac
As result only lan2, lan3 and lan4 have correct (OUI) MAC addresses.
lan1, lan5 and wan interfaces get MAC addresses with incorrect OUI from random data on "boarddata1" partition.

This commit fix this and use first MAC for lan and second MAC for wan interfaces.

Signed-off-by: Paweł Owoc <frut3k7@gmail.com>