media: constify fb ops across all drivers

Now that the fbops member of struct fb_info is const, we can start
making the ops const as well.

Remove the redundant fbops assignments while at it.

v2:
- actually add const in vivid
- fix typo (Christophe de Dinechin)

Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Andy Walls <awalls@md.metrocast.net>
Cc: linux-media@vger.kernel.org
Cc: ivtv-devel@ivtvdriver.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/71794337f8611271f2c1fdb3882119a58e743a87.1575390741.git.jani.nikula@intel.com

drivers/media/pci/ivtv/ivtvfb.c

@@ -925,7 +925,7 @@ static int ivtvfb_blank(int blank_mode, struct fb_info *info)
 	return 0;
 }
 
-static struct fb_ops ivtvfb_ops = {
+static const struct fb_ops ivtvfb_ops = {
 	.owner = THIS_MODULE,
 	.fb_write       = ivtvfb_write,
 	.fb_check_var   = ivtvfb_check_var,
@@ -1049,7 +1049,6 @@ static int ivtvfb_init_vidmode(struct ivtv *itv)
 
 	oi->ivtvfb_info.node = -1;
 	oi->ivtvfb_info.flags = FBINFO_FLAG_DEFAULT;
-	oi->ivtvfb_info.fbops = &ivtvfb_ops;
 	oi->ivtvfb_info.par = itv;
 	oi->ivtvfb_info.var = oi->ivtvfb_defined;
 	oi->ivtvfb_info.fix = oi->ivtvfb_fix;

drivers/media/platform/vivid/vivid-osd.c

@@ -244,7 +244,7 @@ static int vivid_fb_blank(int blank_mode, struct fb_info *info)
 	return 0;
 }
 
-static struct fb_ops vivid_fb_ops = {
+static const struct fb_ops vivid_fb_ops = {
 	.owner = THIS_MODULE,
 	.fb_check_var   = vivid_fb_check_var,
 	.fb_set_par     = vivid_fb_set_par,
@@ -311,7 +311,6 @@ static int vivid_fb_init_vidmode(struct vivid_dev *dev)
 
 	dev->fb_info.node = -1;
 	dev->fb_info.flags = FBINFO_FLAG_DEFAULT;
-	dev->fb_info.fbops = &vivid_fb_ops;
 	dev->fb_info.par = dev;
 	dev->fb_info.var = dev->fb_defined;
 	dev->fb_info.fix = dev->fb_fix;