backlight: constify backlight_ops

backlight_device_register has been expecting a const "ops" argument, and using
it as such, since 9905a43b2d563e6f89e4c63c4278ada03f2ebb14. Let's make the
remaining backlight_ops instances const.

Inspired by hunks of the grsecurity patch, updated for newer kernels.

Signed-off-by: Lionel Debroux <lionel_debroux@yahoo.fr>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/video/backlight/88pm860x_bl.c b/drivers/video/backlight/88pm860x_bl.c
index 38ffc3f..c789c46 100644
--- a/drivers/video/backlight/88pm860x_bl.c
+++ b/drivers/video/backlight/88pm860x_bl.c
@@ -155,7 +155,7 @@
 	return -EINVAL;
 }
 
-static struct backlight_ops pm860x_backlight_ops = {
+static const struct backlight_ops pm860x_backlight_ops = {
 	.options	= BL_CORE_SUSPENDRESUME,
 	.update_status	= pm860x_backlight_update_status,
 	.get_brightness	= pm860x_backlight_get_brightness,