FVP: Update device trees to match cpuidle driver

This patch updates the representation of idle tables and cpu/cluster topology in
the device tree source files for the FVP to what the latest cpuidle driver in
Linux expects. The device tree binaries have also been updated.

Change-Id: If0668b96234f65aa0435fba52f288c9378bd8824
Merge pull request #195 from achingupta/ag/fvp_dt_updates

FVP: Update device trees to match cpuidle driver