meson: build gallium va state tracker

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

meson_options.txt

@@ -94,6 +94,19 @@ option(
   value : '',
   description : 'path to put omx libraries. defaults to omx-bellagio pkg-config pluginsdir.'
 )
+option(
+  'gallium-va',
+  type : 'combo',
+  value : 'auto',
+  choices : ['auto', 'true', 'false'],
+  description : 'enable gallium va state tracker.',
+)
+option(
+  'va-libs-path',
+  type : 'string',
+  value : '',
+  description : 'path to put va libraries. defaults to $libdir/dri.'
+)
 option(
   'vulkan-drivers',
   type : 'string',