media: i2c: refer to config VIDEO_DEV to make ov08x40 image sensor driver usable

Commit 9958d30f38b9 ("media: Kconfig: cleanup VIDEO_DEV dependencies")
removes the config VIDEO_V4L2 as it is merged with config VIDEO_DEV.

Long after this change, commit 38fc5136ac16 ("media: i2c: Add ov08x40 image
sensor driver") introduces and refers to the removed config VIDEO_V4L2,
basically making this driver impossible to build, test and use due to
dependencies that cannot be met.

Refer to config VIDEO_DEV instead to make this driver usable.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Fixes: 38fc5136ac16 ("media: i2c: Add ov08x40 image sensor driver")
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>