fbdev/sunxvr1000: 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/20230803184034.6456-42-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -631,9 +631,7 @@ config FB_XVR2500
 config FB_XVR1000
 	bool "Sun XVR-1000 support"
 	depends on (FB = y) && SPARC64
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	help
 	  This is the framebuffer device for the Sun XVR-1000 and similar
 	  graphics cards.  The driver only works on sparc64 systems where

drivers/video/fbdev/sunxvr1000.c

@@ -61,10 +61,8 @@ static int gfb_setcolreg(unsigned regno,
 
 static const struct fb_ops gfb_ops = {
 	.owner			= THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_setcolreg		= gfb_setcolreg,
-	.fb_fillrect		= cfb_fillrect,
-	.fb_copyarea		= cfb_copyarea,
-	.fb_imageblit		= cfb_imageblit,
 };
 
 static int gfb_set_fbinfo(struct gfb_info *gp)