[U-Boot] powerpc: Drop CONFIG_WALNUT and other related dead code

[Tom Rini]

On Sun, Jan 21, 2018 at 06:16:42PM +0200, Tuomas Tynkkynen wrote:

> CONFIG_WALNUT was dropped in June 2017 in:
> commit 98f705c9cefdfd ("powerpc: remove 4xx support")
> 
> While at it, the related CONFIG_MACH_SPECIFIC and the have_of
> and _machine variables are unused as well, so drop them too.
> 
> Signed-off-by: Tuomas Tynkkynen <tuomas at tuxera.com>

Applied to u-boot/master, thanks!

-- 
Tom
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