geode GX/LX framebuffer register compare patch

[Andres Salomon]

Hi,

This code isn't destined for the kernel, but is useful for debugging
suspend/resume issues where register values aren't being properly restored.
It turned up a few bugs in the lxfb and gxfb power mgmt code that OLPC
uses.  I'm sending it out to get indexed by google/archived in case
other people find it useful.