Demote buggy FPS prints from g_print to GST_DEBUG.

- Port of 646ad50df63af358aa93109d1f5ded2edcd138d1 from
imx-gst-plugins-bad to imx-gst-plugins-base

Change-Id: I2894722961a5ec736a5cbe5618037fd5ae4bab14
diff --git a/ext/gl/gstglimagesink.c b/ext/gl/gstglimagesink.c
index 37a7539..07e3244 100644
--- a/ext/gl/gstglimagesink.c
+++ b/ext/gl/gstglimagesink.c
@@ -1273,7 +1273,7 @@
       glimage_sink->prev_cropmeta = NULL;
 
       if (glimage_sink->run_time > 0) {
-        g_print ("Total showed frames (%lld), playing for (%"GST_TIME_FORMAT"), fps (%.3f).\n",
+        GST_DEBUG ("Total showed frames (%lld), playing for (%"GST_TIME_FORMAT"), fps (%.3f).\n",
                 glimage_sink->frame_showed, GST_TIME_ARGS (glimage_sink->run_time),
                 (gfloat)GST_SECOND * glimage_sink->frame_showed / glimage_sink->run_time);
       }