intel_th: Updates for v5.2

These are:
  * Support for software trace sinks
  * Interrupt handling, MSI support
  * Reworks in resource passing between glue layers and driver core
  * Reworks in buffer management code
  * Various small reworks in the MSU code
  * Support for window switching in MSU "multi" mode
  * A fix for the MSU "single" mode, backportable all the way to v4.4
  * A new "rtit" subdevice
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