[U-Boot] serial: make serial_stub_* to static functions

[Tom Rini]

On Thu, Jun 22, 2017 at 04:48:49PM +0900, Masahiro Yamada wrote:

> Add missing static to serial_stub_puts().
> 
> Unexport serial_stub_{getc,tstc} because they are used locally.
> 
> 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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