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Merge series from Stefan Binding <sbinding@opensource.cirrus.com>: In PC systems using ACPI, the driver is able to read back an SSID from the _SUB property. This SSID uniquely identifies the system, which enables the driver to read the correct firmware and tuning for that system from linux-firmware. Currently there is no way of reading this property from device tree. Add an equivalent property in device tree to perform the same role.