media: rockchip/rga: constify v4l2_m2m_ops structure

The v4l2_m2m_ops structure can be const as it is only passed to
v4l2_m2m_init whose parameter is const.

Done with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/rockchip/rga/rga.c

@@ -97,7 +97,7 @@ static irqreturn_t rga_isr(int irq, void *prv)
 	return IRQ_HANDLED;
 }
 
-static struct v4l2_m2m_ops rga_m2m_ops = {
+static const struct v4l2_m2m_ops rga_m2m_ops = {
 	.device_run = device_run,
 };