staging: media: imx: Remove duplicate Kconfig dependency

The kernel configuration VIDEO_DEV is defined twice in Kconfig.
Thus, the duplicate Kconfig dependency is removed.

Signed-off-by: Rajeshwar R Shinde <coolrrsh@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>