ARM: arm-soc: cpuidle enablement for OMAP

Coupled cpuidle was meant to merge for 3.5 through Len Brown's tree, but
didn't go in because the pull request ended up rejected. So it just got
merged, and we got this staged branch that enables the coupled cpuidle
code on OMAP.

With a stable git workflow from the other maintainer we could have staged
this earlier, but that wasn't the case so we have had to merge it late.

The alternative is to hold it off until 3.7 but given that the code is
well-isolated to OMAP and they are eager to see it go in, I didn't push
back hard in that direction.
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