gma500: move opregion files

We've now sorted them out so they can go into the generic code. In actual
fact only the non MID devices use the functions but they are small and
having the name match i915 is going to help any future merging type work.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>