ipa: ipu3: Explicitly use the statistics parameter

The stats pointer is marked as [[maybe_unused]]. This is a leftover from
a previous commit which was here to keep the compatibility while
transitioning to the new iterative algorithms.

Remove this attribute to make it explicit that stats are really used to
feed the algorithms.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

src/ipa/ipu3/ipu3.cpp

@@ -721,7 +721,7 @@ void IPAIPU3::fillParams(unsigned int frame, ipu3_uapi_params *params)
  */
 void IPAIPU3::parseStatistics(unsigned int frame,
 			      [[maybe_unused]] int64_t frameTimestamp,
-			      [[maybe_unused]] const ipu3_uapi_stats_3a *stats)
+			      const ipu3_uapi_stats_3a *stats)
 {
 	ControlList ctrls(controls::controls);