pps: enable anv source in example config file

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Rohan Garg <rohan.garg@intel.com>
Acked-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13996>

src/tool/pps/cfg/intel.cfg

@@ -74,6 +74,12 @@ data_sources {
   }
 }
 
+data_sources {
+  config {
+    name: "gpu.renderstages.intel"
+  }
+}
+
 duration_ms: 5000
 write_into_file: true
 file_write_period_ms: 500