MIPS: boot: merge build rules of vmlinux.*.itb by using pattern rule

Merge the build rule of vmlinux.{gz,bz2,lzma,lzo}.itb, and also move
'targets' close to the related code.

[[e-mail]:
- Remove leading tabs from assignments to itb_addr_cells, since after
this patch moves the additions to the 'targets' variable the
assignments to itb_addr_cells wound up being treated as part of the
uImage rule above them, causing the .its to incorrectly be generated
with empty ADDR_CELLS.]

Signed-off-by: Masahiro Yamada <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/19095/
Signed-off-by: Paul Burton <[e-mail]>
Cc: Kees Cook <[e-mail]>
Cc: [e-mail]

arch/mips/boot/Makefile

···
 # Flattened Image Tree (.itb) images
 #
 
-targets += vmlinux.itb
-targets += vmlinux.gz.itb
-targets += vmlinux.bz2.itb
-targets += vmlinux.lzma.itb
-targets += vmlinux.lzo.itb
-
 ifeq ($(ADDR_BITS),32)
-	itb_addr_cells = 1
+itb_addr_cells = 1
 endif
 ifeq ($(ADDR_BITS),64)
-	itb_addr_cells = 2
+itb_addr_cells = 2
 endif
 
 targets += vmlinux.its.S
···
 $(obj)/vmlinux.lzo.its: $(obj)/vmlinux.its.S $(VMLINUX) FORCE
 	$(call if_changed,cpp_its_S,lzo,vmlinux.bin.lzo)
 
+targets += vmlinux.itb
+targets += vmlinux.gz.itb
+targets += vmlinux.bz2.itb
+targets += vmlinux.lzma.itb
+targets += vmlinux.lzo.itb
+
 quiet_cmd_itb-image = ITB     $@
       cmd_itb-image = \
 		env PATH="$(objtree)/scripts/dtc:$(PATH)" \
···
 $(obj)/vmlinux.itb: $(obj)/vmlinux.its $(obj)/vmlinux.bin FORCE
 	$(call if_changed,itb-image,$<)
 
-$(obj)/vmlinux.gz.itb: $(obj)/vmlinux.gz.its $(obj)/vmlinux.bin.gz FORCE
-	$(call if_changed,itb-image,$<)
-
-$(obj)/vmlinux.bz2.itb: $(obj)/vmlinux.bz2.its $(obj)/vmlinux.bin.bz2 FORCE
-	$(call if_changed,itb-image,$<)
-
-$(obj)/vmlinux.lzma.itb: $(obj)/vmlinux.lzma.its $(obj)/vmlinux.bin.lzma FORCE
-	$(call if_changed,itb-image,$<)
-
-$(obj)/vmlinux.lzo.itb: $(obj)/vmlinux.lzo.its $(obj)/vmlinux.bin.lzo FORCE
+$(obj)/vmlinux.%.itb: $(obj)/vmlinux.%.its $(obj)/vmlinux.bin.% FORCE
 	$(call if_changed,itb-image,$<)