kbuild: refactor if_changed
'@set -e; $(echo-cmd) $(cmd_$(1)' can be replaced with '$(cmd)'.
Signed-off-by: 
Masahiro Yamada <yamada.masahiro@socionext.com>
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'@set -e; $(echo-cmd) $(cmd_$(1)' can be replaced with '$(cmd)'.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>