media: docs: uAPI: fix table output in LaTeX/PDF format

There are lots of tables that are not properly displayed
in LaTeX/PDF.

Fix the tablecolumns, add longtable where needed and LaTeX
formatting macros, in order to address such issues.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

Documentation/userspace-api/media/v4l/vidioc-decoder-cmd.rst

@@ -59,7 +59,7 @@ In principle, these ioctls are optional, not all drivers may support them. They
 introduced in Linux 3.3. They are, however, mandatory for stateful mem2mem decoders
 (as further documented in :ref:`decoder`).
 
-.. tabularcolumns:: |p{1.1cm}|p{2.4cm}|p{1.2cm}|p{1.6cm}|p{10.6cm}|
+.. tabularcolumns:: |p{2.0cm}|p{1.1cm}|p{2.2cm}|p{11.8cm}|
 
 .. c:type:: v4l2_decoder_cmd
 
@@ -129,10 +129,12 @@ introduced in Linux 3.3. They are, however, mandatory for stateful mem2mem decod
       -
 
 
-.. tabularcolumns:: |p{5.6cm}|p{0.6cm}|p{11.3cm}|
-
 .. _decoder-cmds:
 
+.. tabularcolumns:: |p{5.6cm}|p{0.6cm}|p{11.1cm}|
+
+.. cssclass:: longtable
+
 .. flat-table:: Decoder Commands
     :header-rows:  0
     :stub-columns: 0