rockchip: use generate_mac_from_mmc_cid for emmc target

target/linux/rockchip/armv8/base-files/etc/board.d/02_network

@@ -46,6 +46,13 @@ rockchip_setup_interfaces()
 	esac
 }
 
+generate_mac_from_mmc_cid()
+{
+	local sd_hash=$(sha256sum /sys/class/block/mmcblk*/device/cid | head -n 1)
+	local mac_base=$(macaddr_canonicalize "$(echo "${sd_hash}" | dd bs=1 count=12 2>/dev/null)")
+	echo "$(macaddr_unsetbit_mc "$(macaddr_setbit_la "${mac_base}")")"
+}
+
 nanopi_r4s_get_mac()
 {
 	local interface=$1
@@ -58,7 +65,7 @@ nanopi_r4s_get_mac()
 			address=$(macaddr_setbit_la "$address")
 		fi
 	else
-		address=$(macaddr_generate_from_mmc_cid mmcblk1)
+		address=$(generate_mac_from_mmc_cid)
 		if [ "$interface" = "lan" ]; then
 			address=$(macaddr_add "$address" 1)
 		fi
@@ -92,7 +99,7 @@ rockchip_setup_macs()
 	sharevdi,h3399pc|\
 	sharevdi,guangmiao-g4c|\
 	rocktech,mpc1903)
-		wan_mac=$(macaddr_generate_from_mmc_cid mmcblk0)
+		wan_mac=$(generate_mac_from_mmc_cid)
 		lan_mac=$(macaddr_add "$wan_mac" +1)
 		;;
 	friendlyarm,nanopi-r4s|\