media: imx.rst: add it to v4l-drivers book

Avoid the following warning when building documentation:
	checking consistency... /devel/v4l/patchwork/Documentation/media/v4l-drivers/imx.rst:: WARNING: document isn't included in any toctree

While here, avoid placing all driver authors at just one line at
the html/pdf output.
Acked-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/v4l-drivers/imx.rst

@@ -607,8 +607,9 @@ References
 
 Authors
 -------
-Steve Longerbeam <steve_longerbeam@mentor.com>
-Philipp Zabel <kernel@pengutronix.de>
-Russell King <linux@armlinux.org.uk>
+
+- Steve Longerbeam <steve_longerbeam@mentor.com>
+- Philipp Zabel <kernel@pengutronix.de>
+- Russell King <linux@armlinux.org.uk>
 
 Copyright (C) 2012-2017 Mentor Graphics Inc.

Documentation/media/v4l-drivers/index.rst

@@ -41,6 +41,7 @@ For more details see the file COPYING in the source distribution of Linux.
 	cx88
 	davinci-vpbe
 	fimc
+	imx
 	ivtv
 	max2175
 	meye