This allows specifying partitions in devicetree that are actually not
described in the devicetree to allow referencing them:

    partitions {
            compatible = "fixed-partitions";
            #address-cells = <1>;
            #size-cells = <1>;

            state_part: state {
                    partuuid = "21367da7-c51f-499f-9aad-e1f366992365";
            };
    };

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Enrico Jorns <ejo@pengutronix.de>
Signed-off-by: Roland Hieber <rhi@pengutronix.de>