dt-bindings: mtd: partitions: Allow "nvmem-layout" in generic partition nodes
An "nvmem-layout" node can be used in any partition node, so add it.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
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