[media] adjust some vidioc-*rst tables with wrong columns

Adjust simple cases where the columns on some vidioc files
are overriding their neighbours.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
diff --git a/Documentation/media/uapi/v4l/vidioc-dqevent.rst b/Documentation/media/uapi/v4l/vidioc-dqevent.rst
index 6cd5d70..ad4b826 100644
--- a/Documentation/media/uapi/v4l/vidioc-dqevent.rst
+++ b/Documentation/media/uapi/v4l/vidioc-dqevent.rst
@@ -183,6 +183,8 @@
 
 .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
 
+.. cssclass:: longtable
+
 .. flat-table:: Event Types
     :header-rows:  0
     :stub-columns: 0