greybus: camera: Update CSI config parameters

Remove lines_per_second parameter from csi configuration
structure as VFE driver dropped dependency on it

Signed-off-by: Jacopo Mondi <jacopo.mondi@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>