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i.MX51 and i.MX53 SoCs have a 64-bit SoC unique ID stored in IIM, which can be used as SoC serial number. The same feature is already implemented for i.MX6/i.MX7, so this complements support to earlier SoCs. Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>