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 <[e-mail]>
Reviewed-by: Hans Verkuil <[e-mail]>
Reviewed-by: Sam Ravnborg <[e-mail]>
Acked-by: Helge Deller <[e-mail]>
Cc: Hans Verkuil <[e-mail]>
Cc: Mauro Carvalho Chehab <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/media/test-drivers/vivid/Kconfig

···
 	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

···
 
 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,