drm/i915/opregion: add acpi defines from the spec

It's easier to read the code when the macro names match the spec. Also
add a bunch of missing ones. No functional changes.

Reviewed-and-tested-by: Peter Wu <peter@lekensteyn.nl>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/7cfdd2733b8cc7abae43cfa8c81aed902b69ecd5.1465810007.git.jani.nikula@intel.com