[source] ramips: move umedia build step to Makefile

[LEDE Commits]

mkresin pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=c892f37b30925bb298bd5f79aa7c9ba2f1809e32

commit c892f37b30925bb298bd5f79aa7c9ba2f1809e32
Author: Mathias Kresin <dev at kresin.me>
AuthorDate: Sat Aug 20 01:17:16 2016 +0200

    ramips: move umedia build step to Makefile
    
    Some rt3883 based boards need this one as well.
    
    Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 target/linux/ramips/image/Makefile  | 4 ++++
 target/linux/ramips/image/mt7620.mk | 4 ----
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/target/linux/ramips/image/Makefile b/target/linux/ramips/image/Makefile
index 6116a53..ef30c79 100644
--- a/target/linux/ramips/image/Makefile
+++ b/target/linux/ramips/image/Makefile
@@ -74,6 +74,10 @@ define MkCombineduImage
 	$(call MkImage,lzma,$(KDIR)/vmlinux-$(2).bin.lzma.combined,$(call sysupname,$(1),$(2)),$(6))
 endef
 
+define Build/umedia-header
+	fix-u-media-header -T 0x46 -B $(1) -i $@ -o $@.new && mv $@.new $@
+endef
+
 #
 # The real magic happens inside these templates
 #
diff --git a/target/linux/ramips/image/mt7620.mk b/target/linux/ramips/image/mt7620.mk
index 8e1346d..00dd4f2 100644
--- a/target/linux/ramips/image/mt7620.mk
+++ b/target/linux/ramips/image/mt7620.mk
@@ -26,10 +26,6 @@ define Build/poray-header
 		mv $@.new $@
 endef
 
-define Build/umedia-header
-	fix-u-media-header -T 0x46 -B $(1) -i $@ -o $@.new && mv $@.new $@
-endef
-
 define Build/elecom-header
 	cp $@ $(KDIR)/v_0.0.0.bin
 	( \