sys/v4l2/v4l2src_calls.c: Make sure the probed frame sizes are reversed in the result...

sys/v4l2/v4l2src_calls.c: Make sure the probed frame sizes are reversed in the resulting caps also when using V4L2_FR...

Original commit message from CVS:
Patch by: William M. Brack <wbrack at mmm com hk>
* sys/v4l2/v4l2src_calls.c:
(gst_v4l2src_probe_caps_for_format_and_size),
(gst_v4l2src_probe_caps_for_format):
Make sure the probed frame sizes are reversed in the resulting
caps also when using V4L2_FRMSIZE_STEPWISE (so they end up
highest resolution first); also remove unused variable.
(Partly fixes #520092)