fbdev/sstfb: 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: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230803184034.6456-41-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -1340,9 +1340,7 @@ config FB_VOODOO1
 	tristate "3Dfx Voodoo Graphics (sst1) support"
 	depends on FB && PCI
 	depends on FB_DEVICE
-	select FB_CFB_FILLRECT
+	select FB_IOMEM_HELPERS
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
 	select VIDEO_NOMODESET
 	help
 	  Say Y here if you have a 3Dfx Voodoo Graphics (Voodoo1/sst1) or

drivers/video/fbdev/sstfb.c

@@ -1310,12 +1310,10 @@ static int sstfb_setup(char *options)
 
 static const struct fb_ops sstfb_ops = {
 	.owner		= THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_check_var	= sstfb_check_var,
 	.fb_set_par	= sstfb_set_par,
 	.fb_setcolreg	= sstfb_setcolreg,
-	.fb_fillrect	= cfb_fillrect, /* sstfb_fillrect */
-	.fb_copyarea	= cfb_copyarea, /* sstfb_copyarea */
-	.fb_imageblit	= cfb_imageblit,
 	.fb_ioctl	= sstfb_ioctl,
 };