MIPS: boot: add missing targets for vmlinux.*.its

The build rule of vmlinux.*.its is invoked by $(call if_changed,...)
but it always rebuilds the target needlessly due to missing targets.

Signed-off-by: Masahiro Yamada <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/19092/
Signed-off-by: Paul Burton <[e-mail]>
Cc: Kees Cook <[e-mail]>
Cc: [e-mail]

arch/mips/boot/Makefile

···
 $(obj)/vmlinux.its.S: $(addprefix $(srctree)/arch/mips/$(PLATFORM)/,$(ITS_INPUTS)) FORCE
 	$(call if_changed,its_cat)
 
+targets += vmlinux.its
+targets += vmlinux.gz.its
+targets += vmlinux.bz2.its
+targets += vmlinux.lzmo.its
+targets += vmlinux.lzo.its
+
 quiet_cmd_cpp_its_S = ITS     $@
       cmd_cpp_its_S = $(CPP) -P -C -o $@ $< \
 		        -DKERNEL_NAME="\"Linux $(KERNELRELEASE)\"" \