build: move mktplinkfw-combined command to image-commands.mk

We will need "mktplinkfw-combined" command also in the "ramips" target
for new MediaTek based TP-Link devices, with "safeloader" image type.

Also, rename the command to "tplink-v1-header", use "VERSION_DIST"
variable instead of "OpenWrt" and allow passing additional parameters.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

include/image-commands.mk

@@ -233,6 +233,15 @@ define Build/sysupgrade-tar
 		$@
 endef
 
+define Build/tplink-v1-header
+	$(STAGING_DIR_HOST)/bin/mktplinkfw \
+		-c -H $(TPLINK_HWID) -W $(TPLINK_HWREV) -L $(KERNEL_LOADADDR) \
+		-E $(if $(KERNEL_ENTRY),$(KERNEL_ENTRY),$(KERNEL_LOADADDR)) \
+		-m $(TPLINK_HEADER_VERSION) -N "$(VERSION_DIST)" -V $(REVISION) \
+		-k $@ -o $@.new $(1)
+	@mv $@.new $@
+endef
+
 define Build/tplink-v2-header
 	$(STAGING_DIR_HOST)/bin/mktplinkfw2 \
 		-c -V "ver. 2.0" -B $(TPLINK_BOARD_ID) $(1) -k $@ -o $@.new