The pmu-sram is used to store resume code, suspend/resume need get the
address of it. Therefore add a binding and documentation for it.
Signed-off-by: NTony Xie <xxx@rock-chips.com>
Signed-off-by: NChris Zhong <zyw@rock-chips.com>
Reviewed-by: NDoug Anderson <dianders@chromium.org>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>