pinctrl: pinctrl-single: add header include guard
Add a header include guard just in case. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Link: https://lore.kernel.org/r/20190720115858.7015-1-yamada.masahiro@socionext.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>
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