ramips: Add factory image for Qding QC202

Added factory image using mkqdimg.

Signed-off-by: Coia Prant <coiaprant@gmail.com>
Link: openwrt/openwrt#20102
(cherry picked from commit d0383bb)
Link: openwrt/openwrt#20159
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

Author: rbqvq

target/linux/ramips/image/mt76x8.mk

@@ -21,6 +21,12 @@ define Build/elecom-header
 	mv $@.new $@
 endef
 
+define Build/qding-header
+  $(STAGING_DIR_HOST)/bin/mkqdimg \
+    -B $(1) -f $@ -o $@.new
+  mv $@.new $@
+endef
+
 define Build/ravpower-wd009-factory
 	mkimage -A mips -T standalone -C none -a 0x80010000 -e 0x80010000 \
 		-n "OpenWrt Bootloader" -d $(UBOOT_PATH) $@.new
@@ -538,6 +544,8 @@ define Device/qding_qc202
   DEVICE_VENDOR := Qding
   DEVICE_MODEL := QC202
   DEVICE_PACKAGES := kmod-i2c-mt7628 kmod-gpio-beeper kmod-input-matrix-keypad kmod-input-evdev uboot-envtools
+  IMAGES += factory.bin
+  IMAGE/factory.bin := $$(sysupgrade_bin) | qding-header qc202
 endef
 TARGET_DEVICES += qding_qc202