[media] v4l: Add subdev selections documentation: svg and dia files

Add svga and dia files for V4L2 subdev selections documentation.
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Documentation/DocBook/media/v4l/subdev-image-processing-crop.svg

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+  </text>
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Documentation/DocBook/media/v4l/subdev-image-processing-scaling-multi-source.svg

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+    <tspan x="60" y="224">sink</tspan>
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+  </text>
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