[Linaro-acpi] APM Mustang topic branch

Howdy.

I've updated the acpi-topic-mustang branch so that it now works properly again (mostly because I needed it to run some experiments and tests).

It's basically our acpi.git master plus ports of patches scavenged mostly from the Fedora kernel, some of which may or may not end up in mainline in their present form. Use these patches wisely. They should not be considered final since they have not been accepted upstream.

Pretty much everything on the box works.