powerpc/e500mc: Add support for the wait instruction in e500_idle
e500mc cannot doze or nap due to an erratum (as well as having a different mechanism than previous e500), but it has a "wait" instruction that is similar to doze. On 64-bit, due to the soft-irq-disable mechanism, the existing book3e_idle should be used instead. Signed-off-by: Vakul Garg <vakul@freescale.com> Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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