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The XDomain properties can be useful for service drivers, for example to implement a registry for the services they expose. So far there has been no need for service drivers to specify these but with the USB4STREAM driver that we are going to use them. This adds remote and local side properties that the service drivers have access to. Remote side is read-only but the local side can be changed by a service driver. Also provide a mechanism to notify the remote side that there are changes. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>