m68k/io: Remove useless definition of mmiowb()
m68k includes asm-generic/io.h, which provides a dummy definition of mmiowb() if one isn't already provided by the architecture. Remove the useless definition. Acked-by: NGeert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: NGeert Uytterhoeven <geert@linux-m68k.org> Acked-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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