media: imx-jpeg: Constify static struct v4l2_m2m_ops

The only usage of mxc_jpeg_m2m_ops is to pass its address to
v4l2_m2m_init() which takes a pointer to const struct v4l2_m2m_ops. Make
it const to allow the compiler to put it in read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/imx-jpeg/mxc-jpeg.c

@@ -1890,7 +1890,7 @@ static const struct v4l2_file_operations mxc_jpeg_fops = {
 	.mmap		= v4l2_m2m_fop_mmap,
 };
 
-static struct v4l2_m2m_ops mxc_jpeg_m2m_ops = {
+static const struct v4l2_m2m_ops mxc_jpeg_m2m_ops = {
 	.device_run	= mxc_jpeg_device_run,
 };