V4L/DVB (3152): Fixes some troubles at v4l2 compat stuff

- This patch fixes merge and typo problems in v4l2/compat, and fixes
VIDIOC_STREAMON, VIDIOC_STREAMOFF & VIDIOC_S_FBUF.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>