powerpc: Remove PowerPC 601
Powerpc 601 is 25 years old.
It is not selected by any defconfig.
It requires a lot of special handling as it deviates from the
standard 6xx.
Retire it.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/00a6948d659e017f8ca63437d1384222c3aede57.1601362098.git.christophe.leroy@csgroup.eu
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