powerpc: Remove CONFIG_PPC601_SYNC_FIX
This config option isn't in any defconfig.
The very first versions of Powerpc 601 have a bug which
requires additional sync before and/or after some instructions.
This was more than 25 years ago and time has come to retire
those buggy versions of the 601 from the kernel.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/55b46bff16705b1ae7bf0a60ccd522b1010ebf75.1601362098.git.christophe.leroy@csgroup.eu
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