media: hantro: Constify static struct v4l2_m2m_ops

The only usage of vpu_m2m_ops is to pass its address to v4l2_m2m_init()
which has a pointer to const struct v4l2_m2m_ops as argument. Make it
const to allow the compiler to put it in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/hantro/hantro_drv.c

@@ -179,7 +179,7 @@ static void device_run(void *priv)
 	hantro_job_finish_no_pm(ctx->dev, ctx, VB2_BUF_STATE_ERROR);
 }
 
-static struct v4l2_m2m_ops vpu_m2m_ops = {
+static const struct v4l2_m2m_ops vpu_m2m_ops = {
 	.device_run = device_run,
 };