powerpc: Drop CONFIG_WALNUT and other related dead code
CONFIG_WALNUT was dropped in June 2017 in: commit 98f705c9 ("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: NTuomas Tynkkynen <tuomas@tuxera.com>
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