dt-bindings: nvmem: qfprom: Add optional power-domains property

dt-bindings: nvmem: qfprom: Add optional power-domains property

qfprom devices on some SoCs need to vote on the performance state
of a power-domain, so add the power-domains optional property to the
bindings

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210806085947.22682-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>