[media] docs-rst: v4l2-drivers book: adjust column margins

A few tables are not properly output on LaTeX format.

Fix them.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/v4l-drivers/cpia2.rst

@@ -55,6 +55,9 @@ may be done automatically by your distribution.
 Driver options
 ~~~~~~~~~~~~~~
 
+.. tabularcolumns:: |p{13ex}|L|
+
+
 ==============  ========================================================
 Option		Description
 ==============  ========================================================

Documentation/media/v4l-drivers/si476x.rst

@@ -31,6 +31,8 @@ The drivers exposes following files:
   information. The contents of the file is binary data of the
   following layout:
 
+  .. tabularcolumns:: |p{7ex}|p{12ex}|L|
+
   =============  ==============   ====================================
   Offset	 Name		  Description
   =============  ==============   ====================================
@@ -63,6 +65,8 @@ The drivers exposes following files:
   This file contains statistics about RDS receptions. It's binary data
   has the following layout:
 
+  .. tabularcolumns:: |p{7ex}|p{12ex}|L|
+
   =============  ==============   ====================================
   Offset	 Name		  Description
   =============  ==============   ====================================
@@ -77,6 +81,8 @@ The drivers exposes following files:
 
   The layout is:
 
+  .. tabularcolumns:: |p{7ex}|p{12ex}|L|
+
   =============  ==============   ====================================
   Offset	 Name		  Description
   =============  ==============   ====================================
@@ -100,6 +106,8 @@ The drivers exposes following files:
 
   The layout is:
 
+  .. tabularcolumns:: |p{7ex}|p{12ex}|p{60ex}|
+
   =============  ==============   ====================================
   Offset	 Name		  Description
   =============  ==============   ====================================