treewide: move mktplinkfw to tplink-v1-image in image-commands.mk

This move the slightly different target-specific implementations of
mktplinkfw from the targets to include/image-commands.mk and renames
it to tplink-v1-image. Having a common version will increase
consistency between implementation and will complete the
tplink build command already present in the new location.

Due to the slight differences of the original implementations, this
also does some adjustments to the device build commands/variables.

This also moves rootfs_align as this is required as dependency.

Tested on:
- TL-WDR4300 v1 (ath79, factory)
- TL-WDR4900 v1 (mpc85xx, sysupgrade)
- RE210 v1 (ramips, see Tested-by)

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Tested-by: Christoph Krapp <achterin@googlemail.com>

include/image-commands.mk

@@ -3,6 +3,10 @@
 IMAGE_KERNEL = $(word 1,$^)
 IMAGE_ROOTFS = $(word 2,$^)
 
+define rootfs_align
+$(patsubst %-256k,0x40000,$(patsubst %-128k,0x20000,$(patsubst %-64k,0x10000,$(patsubst squashfs%,0x4,$(patsubst root.%,%,$(1))))))
+endef
+
 define Build/uImage
 	mkimage -A $(LINUX_KARCH) \
 		-O linux -T kernel \
@@ -335,6 +339,24 @@ define Build/tplink-v1-header
 	@mv $@.new $@
 endef
 
+# combine kernel and rootfs into one image
+# mktplinkfw <type> <optional extra arguments to mktplinkfw binary>
+# <type> is "sysupgrade" or "factory"
+#
+# -a align the rootfs start on an <align> bytes boundary
+# -j add jffs2 end-of-filesystem markers
+# -s strip padding from end of the image
+# -X reserve <size> bytes in the firmware image (hexval prefixed with 0x)
+define Build/tplink-v1-image
+	-$(STAGING_DIR_HOST)/bin/mktplinkfw \
+		-H $(TPLINK_HWID) -W $(TPLINK_HWREV) -F $(TPLINK_FLASHLAYOUT) \
+		-N "$(VERSION_DIST)" -V $(REVISION) -m $(TPLINK_HEADER_VERSION) \
+		-k $(IMAGE_KERNEL) -r $(IMAGE_ROOTFS) -o $@.new -j -X 0x40000 \
+		-a $(call rootfs_align,$(FILESYSTEM)) \
+		$(wordlist 2,$(words $(1)),$(1)) \
+		$(if $(findstring sysupgrade,$(word 1,$(1))),-s) && mv $@.new $@ || rm -f $@
+endef
+
 define Build/tplink-v2-header
 	$(STAGING_DIR_HOST)/bin/mktplinkfw2 \
 		-c -H $(TPLINK_HWID) -W $(TPLINK_HWREV) -L $(KERNEL_LOADADDR) \