Add common cpuidle code for consolidation.

Quoted 10 lines · Robert Lee

Besides just code consolidation, a
default "WFI" state is now used with default parameters that different from your original paramenters. The assumption is that if you have a WFI only idle state, the parameters in the new default WFI are more realistic as a true WFI only hardware state incurs minimal latency(<1us) or power penalty to enter and exit.

If your platform actually performs other platform specific functionality upon entering WFI and the default parameters do not accurately reflect the exit_latency and target_residency given in the common default state, please say so.

I'm not sure what you mean by "WFI only". On OMAP, WFI is the entry point for all the idle states, with varying latencies. The latencies are then dependent on how the states are programmed for the various power domains. Upon WFI, the hardware then takes over puts the powerdomains to their programmed states.