powerpc: update comments for generic idle conversion
As of commit 799fef06 ("powerpc: Use generic idle loop"), this applies to arch_cpu_idle() instead of cpu_idle(). Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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