media: imx-ic-prpencvf: Use empty initializer to clear all struct members

{0} only cleans the first member of the structure.

Use {} instead, which cleans all the members of the structure.

Reported-by: Steve Longerbeam <slongerbeam@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>