V4L/DVB (13518): spec: regenerate videodev2.h.xml

After excluding .h.xml from the whitespace to tab conversion I had to
regenerate this xml file. The only changes here are whitespace changes.

If we change videodev2.h in the future, then videodev2.h.xml will only
show that same change and no more unrelated whitespace changes.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>