brcm63xx: fix wifi mac generation

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@iopsys.eu>

iopsys-brcm63xx-arm/base-files/lib/netifd/wireless/mac80211.sh

@@ -463,7 +463,7 @@ mac80211_generate_mac() {
 
 	oIFS="$IFS"; IFS=":"; set -- $ref; IFS="$oIFS"
 
-	b1=$(( 0x$6 | 0x2 ))
+	b1=$(( 0x$1 | 0x02 ))
 	b6=$(((0x$6 + 0x$macidx) & 0xff))
 
 	printf "%02x:%s:%s:%s:%s:%02x" $b1 $2 $3 $4 $5 $b6