Makes it possible to define a rockchip,pmu phandle in the cpus node directly
referencing the pmu syscon instead of searching for specific compatible.

The old way of finding the pmu stays of course available.
Signed-off-by: NKever Yang <kever.yang@rock-chips.com>
Tested-by: NKevin Hilman <khilman@linaro.org>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>