media: dt-bindings: nokia,smia: Remove nokia,nvm-size property

nokia,nvm-size property was removed from the bindings but it was left in
the example. Remove it from the example, too.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>