[RFC] Generic CPU save/restore PM support

[Russell King - ARM Linux]

The following patch series implements infrastructure to save/restore
CPU state on suspend/resume PM events, and updates SA11x0, PXA and
Samsung platforms to use this.

Not all CPU support files are updated with the necessary changes -
currently only ARM920, ARM926, SA11x0, XScale, XScale3, V6 and V7
CPUs are supported.

I've build-tested this for Assabet, PXA, and S3C2410, but not boot
tested it yet.