media/vivid: Use fbdev I/O helpers

Set struct fb_ops and with FB_DEFAULT_IOMEM_OPS, fbdev's initializer
for I/O memory. Sets the callbacks to the cfb_ and fb_io_ functions.
Select the correct modules with Kconfig's FB_IOMEM_HELPERS token.

The macro and token set the currently selected values, so there is
no functional change.

v3:
	* use _IOMEM_ in commit message
v2:
	* updated to use _IOMEM_ tokens

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Helge Deller <deller@gmx.de>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230803184034.6456-2-tzimmermann@suse.de

drivers/media/test-drivers/vivid/Kconfig

@@ -3,11 +3,9 @@ config VIDEO_VIVID
 	tristate "Virtual Video Test Driver"
 	depends on VIDEO_DEV && !SPARC32 && !SPARC64 && FB
 	depends on HAS_DMA
+	select FB_IOMEM_HELPERS
 	select FONT_SUPPORT
 	select FONT_8x16
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
 	select VIDEOBUF2_VMALLOC
 	select VIDEOBUF2_DMA_CONTIG
 	select VIDEO_V4L2_TPG

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

@@ -246,12 +246,10 @@ static int vivid_fb_blank(int blank_mode, struct fb_info *info)
 
 static const struct fb_ops vivid_fb_ops = {
 	.owner = THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_check_var   = vivid_fb_check_var,
 	.fb_set_par     = vivid_fb_set_par,
 	.fb_setcolreg   = vivid_fb_setcolreg,
-	.fb_fillrect    = cfb_fillrect,
-	.fb_copyarea    = cfb_copyarea,
-	.fb_imageblit   = cfb_imageblit,
 	.fb_cursor      = NULL,
 	.fb_ioctl       = vivid_fb_ioctl,
 	.fb_pan_display = vivid_fb_pan_display,