[media] docs-rst: add column hints for pixfmt-002 and pixfmt-006

Add column hints for LaTeX to format columns on the tables inside
pixfmt-002.rst and pixfmt-006.rst.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/v4l/pixfmt-002.rst

@@ -7,7 +7,9 @@ Single-planar format structure
 
 .. _v4l2-pix-format:
 
-.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.7cm}|
+.. tabularcolumns:: |p{4.0cm}|p{2.5cm}|p{11.0cm}|
+
+.. cssclass:: longtable
 
 .. flat-table:: struct v4l2_pix_format
     :header-rows:  0

Documentation/media/uapi/v4l/pixfmt-006.rst

@@ -25,6 +25,7 @@ needs to be filled in.
    colorspaces except for BT.2020 which uses limited range R'G'B'
    quantization.
 
+.. tabularcolumns:: |p{6.0cm}|p{11.5cm}|
 
 .. _v4l2-colorspace:
 
@@ -183,6 +184,8 @@ needs to be filled in.
 
 .. _v4l2-ycbcr-encoding:
 
+.. tabularcolumns:: |p{6.5cm}|p{11.0cm}|
+
 .. flat-table:: V4L2 Y'CbCr Encodings
     :header-rows:  1
     :stub-columns: 0
@@ -252,6 +255,8 @@ needs to be filled in.
 
 .. _v4l2-quantization:
 
+.. tabularcolumns:: |p{6.5cm}|p{11.0cm}|
+
 .. flat-table:: V4L2 Quantization Methods
     :header-rows:  1
     :stub-columns: 0