realtek: build DGS-1210 images with CAMEO tag

From now on we will insert CAMEO tags into sysupgrade images for
DGS-1210 devices. This will make the "OS:...FAILED" and "FS:...FAILED"
messages go away.
Signed-off-by: NMarkus Stockhausen <markus.stockhausen@gmx.de>
(cherry picked from commit e763c4c8)

target/linux/realtek/image/Makefile

@@ -17,6 +17,10 @@ define Build/zyxel-vers
        done ) >> $@
 endef
 
+define Build/dlink-cameo
+	$(SCRIPT_DIR)/cameo-tag.py $@ $(DLINK_KERNEL_PART_SIZE)
+endef
+
 define Build/dlink-headers
         dd if=$@ bs=$(DLINK_KERNEL_PART_SIZE) count=1 of=$@.kernel_part; \
         dd if=$@ bs=$(DLINK_KERNEL_PART_SIZE) skip=1 of=$@.rootfs_part; \

target/linux/realtek/image/rtl838x.mk

@@ -16,6 +16,7 @@ define Device/d-link_dgs-1210
   IMAGE_SIZE := 13824k
   DEVICE_VENDOR := D-Link
   DLINK_KERNEL_PART_SIZE := 1572864
+  KERNEL := kernel-bin | append-dtb | gzip | uImage gzip | dlink-cameo
 endef
 
 define Device/d-link_dgs-1210-10p