sched: modify timer and workqueue framework to allow migration

Hi Guys,

I have been working on this activity since some time and V2 of patches is up for review over kernel mailing list. If any of us is interested in using these patches, can pick them from:

http://git.linaro.org/gitweb?p=arm/big.LITTLE/mp.git%3Ba=shortlog%3Bh=refs/h...

Patches are applied over a merge of v3.6 and workqueue-for-3.7 branch from tejun.

Blueprint of this activity:

https://blueprints.launchpad.net/linaro-power-kernel/+spec/timer-workqueue-c...

NOTE: This branch isn't merged into big LITTLE MP merge branch till now. Waiting for feedback from mainline.

-- viresh