[U-Boot] stdio: staticize locally-used call-backs

[Tom Rini]

On Tue, Sep 30, 2014 at 04:01:45PM -0700, Eric Nelson wrote:

> The various nulldev_x and stdio_serial_x calls are only used indirectly
> through the nulldev and serial devices, so make them static and
> prevent the dreaded "Should it be static?" warning with "make C=1".
> 
> Signed-off-by: Eric Nelson <eric.nelson at boundarydevices.com>

Applied to u-boot/master, thanks!

-- 
Tom
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