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
1 file changed