Add entry for genpd with Rafael, myself and Ulf as co-maintainers.
Signed-off-by: NKevin Hilman <khilman@kernel.org>
Acked-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>