Support reading Subsystem ID from Device Tree

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.

diff --cc MAINTAINERS
Simple merge

diff --cc sound/soc/codecs/lpass-wsa-macro.c
Simple merge

diff --cc sound/soc/qcom/qdsp6/audioreach.c
Simple merge

diff --cc sound/soc/qcom/sc8280xp.c
Simple merge

diff --cc sound/soc/sof/imx/imx-common.c
Simple merge