Rename doc/design/v4l2 source.jpg -> doc/design/v4l2_source.jpg

Because having spaces in file names is a terrible idea, generally,
and they break the build, specifically.

http://sponge/2d4deec2-9ba4-4e8f-a42f-0e745f5ce5d0

Change-Id: I7d3a9d7b43f959aa10b501b0130f4fd3b4760e1a
1 file changed