For HiWiFi series devices, label_mac can be read from bdinfo partition,
and lan_mac, wlan2g_mac are same as the label_mac. Converting label_mac
to wlan5g_mac only needs to unset 6th bit. (It seems that all HiWiFi's
label_mac start with D4:EE)
For example:
label D4:EE:07:32:84:88
lan D4:EE:07:32:84:88
wan D4:EE:07:32:84:89
wlan2g D4:EE:07:32:84:88
wlan5g D0:EE:07:32:84:88
Tested on HiWiFi HC5661.
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
