FROMLIST: ASoC: SOF: Add DSP firmware trace event support

Add a trace event buffer that can be used by userspace to read DSP runtime
trace events alongside bespoke trace data in realtime for firmware debug.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
(cherry picked from commit 0d6df6c1479a501ccf9d8c3a0e145f6f6586467d)
Link: https://github.com/thesofproject/linux/commit/0d6df6c1479a501ccf9d8c3a0e145f6f6586467d


Signed-off-by: Samaga Prasanna Krishna <samaga.krishna@intel.corp-partner.google.com>

BUG=b:110025789
TEST=Test Audio use cases after full SOF series patches are applied.

Change-Id: I8c35f7b38dfd7a2a066d19456e69aa61cf3bc6fd
Reviewed-on: https://chromium-review.googlesource.com/1120591


Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>