fbdev/fm2fb: 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/20230803184034.6456-11-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -269,9 +269,7 @@ config FB_AMIGA_AGA
 config FB_FM2
 	bool "Amiga FrameMaster II/Rainbow II support"
 	depends on (FB = y) && ZORRO
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	help
 	  This is the frame buffer device driver for the Amiga FrameMaster
 	  card from BSC (exhibited 1992 but not shipped as a CBM product).

drivers/video/fbdev/fm2fb.c

@@ -167,11 +167,9 @@ static int fm2fb_blank(int blank, struct fb_info *info);
 
 static const struct fb_ops fm2fb_ops = {
 	.owner		= THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_setcolreg	= fm2fb_setcolreg,
 	.fb_blank	= fm2fb_blank,
-	.fb_fillrect	= cfb_fillrect,
-	.fb_copyarea	= cfb_copyarea,
-	.fb_imageblit	= cfb_imageblit,
 };
 
     /*