media: davinci: vpif_capture: fix error return code in vpif_probe()

Set error return code, when get platform data failed.

Fixes: b4a4547371b9 ("media: davinci: Init async notifier after registering V4L2 device")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Lad Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>