vc032x:   Light frequency was not initialized.
          Change the pixel format of bridge VC0321 to V4L2_PIX_FMT_YUV420
              ('YU12').
          Set a bridge to all webcams.
Signed-off-by: NJean-Francois Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>