mediatek: add support for device zbt-z8103ax-c

- adopted MTD partition size increase from 64M to 128M
  -> this allows boot to complete
- moved MAC addressing stuff out of partition definitions
- all MAC addressing stuff is in .dtsi

Specifications:

SoC: MediaTek MT7981B
RAM: 256MiB
Flash: Winbond SPI-NAND 128 MiB
Switch: 1 WAN, 3 LAN (Gigabit) MediaTek MT7531
Buttons: Reset, Mesh
Power: DC 12V 1A
WiFi: MT7981B 2.4Ghz & 5.8Ghz

Led Layout from bottom to top:

    Power
    Mesh (RGB Led, user controllable, default set to OpenWrt Status)
    WLAN 2 GHz (user controllable)
    WAN (user controllable)
    LAN3
    LAN2
    LAN1
    WLAN 5 GHz (Not on front panel but blinks through enclosure,
               user controllable)

Buttons:

    Reset
    Mesh (user controllable, no default function)

Installation:

A. Through U-Boot menu:

 -  Prepare your connecting computer to use a static IP in
	network 192.168.1.0/24
 -  Power down the router and hold in the Reset button.
 -  While holding in the button power up the router again.
 -  Hold the button in for 10 seconds and then release.
 -  Use your browser to go to 192.168.1.1
 -  If you see a GUI allowing for flashing firmware then
	you got the right model.
 -  Upload the sysupgrade file.

Note: Recovery GUI can be used to recover from an incorrect
      firmware flash.

B. Through OpenWrt Dashboard:

    If your router comes with OpenWrt preinstalled
	(modified by the seller), you can easily upgrade
	by going to the dashboard (192.168.1.1) and then
	navigate to System -> Backup/Flash firmware,
	then flash the firmware

MAC Addresses were found in Factory partition:

offset 0x4 F8:5E:3C:xx:xx:aa --> Router Label -2
offset 0xa F8:5E:3C:xx:xx:bb --> Router Label -1
offset 0x24 F8:5E:3C:xx:xx:cc --> Router Label +1
offset 0x2a F8:5E:3C:xx:xx:yy --> printed on Router Label

Signed-off-by: Jörg Seitz <github.joeterminal@xoxy.net>
Link: https://github.com/openwrt/openwrt/pull/19823
(cherry picked from commit 479f1403f2)
Link: https://github.com/openwrt/openwrt/pull/21464
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/mediatek/dts/mt7981b-zbtlink-zbt-z8103ax-c.dts

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+
+#include "mt7981b-zbtlink-zbt-z8103ax.dtsi"
+
+/ {
+	model = "Zbtlink 3000M(WiFi6) ZBT-Z8103AX-C";
+	compatible = "zbtlink,zbt-z8103ax-c", "mediatek,mt7981b";
+};

target/linux/mediatek/filogic/base-files/etc/board.d/01_leds

@@ -303,7 +303,8 @@ xiaomi,redmi-router-ax6000-stock|\
 xiaomi,redmi-router-ax6000-ubootmod)
 	ucidef_set_led_netdev "wan" "wan" "rgb:network" "wan"
 	;;
-zbtlink,zbt-z8103ax)
+zbtlink,zbt-z8103ax|\
+zbtlink,zbt-z8103ax-c)
 	ucidef_set_led_netdev "wan" "wan" "green:wan" "eth1" "link tx rx"
 	;;
 zyxel,ex5601-t0-stock|\

target/linux/mediatek/filogic/base-files/etc/board.d/02_network

@@ -19,7 +19,8 @@ mediatek_setup_interfaces()
 	nokia,ea0326gmp|\
 	mercusys,mr80x-v3|\
 	routerich,ax3000-v1|\
-	zbtlink,zbt-z8103ax)
+	zbtlink,zbt-z8103ax|\
+	zbtlink,zbt-z8103ax-c)
 		ucidef_set_interfaces_lan_wan "lan1 lan2 lan3" eth1
 		;;
 	acelink,ew-7886cax)

target/linux/mediatek/image/filogic.mk

@@ -3041,6 +3041,23 @@ define Device/zbtlink_zbt-z8103ax
 endef
 TARGET_DEVICES += zbtlink_zbt-z8103ax
 
+define Device/zbtlink_zbt-z8103ax-c
+  DEVICE_VENDOR := Zbtlink
+  DEVICE_MODEL := ZBT-Z8103AX-C
+  DEVICE_DTS := mt7981b-zbtlink-zbt-z8103ax-c
+  DEVICE_DTS_DIR := ../dts
+  DEVICE_PACKAGES := kmod-mt7915e kmod-mt7981-firmware mt7981-wo-firmware
+  KERNEL_IN_UBI := 1
+  UBINIZE_OPTS := -E 5
+  BLOCKSIZE := 128k
+  PAGESIZE := 2048
+  IMAGE_SIZE := 65536k
+  IMAGES += factory.bin
+  IMAGE/factory.bin := append-ubi | check-size $$(IMAGE_SIZE)
+  IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
+endef
+TARGET_DEVICES += zbtlink_zbt-z8103ax-c
+
 define Device/zyxel_ex5601-t0-stock
   DEVICE_VENDOR := Zyxel
   DEVICE_MODEL := EX5601-T0