Hi,

The following patchset changes the PM core so that driver callbacks
are executed automatically when subsystem ones are not present and
uses the new PM core's behavior to simplify the platform and AMBA bus
types (there probably are many more bus types that may be simplified
this way, but those two were the easiest targets for me).

The reasons why to do this are outlined in the changelog of the second patch.

Comments welcome!

Thanks,
Rafael