[media] smiapp: Use non-binning limits if the binning limit is zero

Some sensors do use binning but do not have valid limits in binning
registers. Use non-binning limits in that case.

Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>