[U-Boot] gpio: add static to get_function()

[Tom Rini]

On Thu, Jun 22, 2017 at 04:50:25PM +0900, Masahiro Yamada wrote:

> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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