fbdev/mmpfb: 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/20230803184034.6456-26-tzimmermann@suse.de

drivers/video/fbdev/mmp/fb/Kconfig

@@ -2,9 +2,7 @@
 config MMP_FB
 	tristate "fb driver for Marvell MMP Display Subsystem"
 	depends on FB
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	default y
 	help
 		fb driver for Marvell MMP Display Subsystem

drivers/video/fbdev/mmp/fb/mmpfb.c

@@ -454,14 +454,12 @@ static int mmpfb_blank(int blank, struct fb_info *info)
 
 static const struct fb_ops mmpfb_ops = {
 	.owner		= THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_blank	= mmpfb_blank,
 	.fb_check_var	= mmpfb_check_var,
 	.fb_set_par	= mmpfb_set_par,
 	.fb_setcolreg	= mmpfb_setcolreg,
 	.fb_pan_display	= mmpfb_pan_display,
-	.fb_fillrect	= cfb_fillrect,
-	.fb_copyarea	= cfb_copyarea,
-	.fb_imageblit	= cfb_imageblit,
 };
 
 static int modes_setup(struct mmpfb_info *fbi)