teflon: Initial commit

Teflon is a Gallium frontend that TensorFlow Lite can load to delegate
the execution of operations in a neural network model.

See docs for more.

Acked-by: Christian Gmeiner <cgmeiner@igalia.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25714>

meson_options.txt

@@ -591,6 +591,13 @@ option(
                 'Default: [`auto`]'
 )
 
+option(
+  'teflon',
+  type : 'boolean',
+  value : false,
+  description : 'Enable TensorFlow Lite delegate. Default: false'
+)
+
 option(
   'gpuvis',
   type : 'boolean',