Voice Activity Detection Threat model

Signed-off-by: Gabor Abonyi <gabor.abonyi@arm.com>
Change-Id: I66f4394740fe848cb7fa2bc3bb23aa6b4da69f57
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+Threat Models
+=============
+
+.. toctree::
+    :maxdepth: 1
+    :glob:
+
+    *
+
+--------------
+
+*Copyright (c) 2022, Arm Limited. All rights reserved.*