[U-Boot] Removed unused references to CONFIG_SERIALx

[Tom Rini]

On Tue, Aug 07, 2018 at 07:08:32AM -0500, Adam Ford wrote:

> After creating CONS_INDEX and migrating a bunch of boards to it,
> there are a bunch of defined references to CONFIG_SERIALx which
> are not referenced in any C code or #ifdef, so they can now be
> removed
> 
> Signed-off-by: Adam Ford <aford173 at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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