fbdev/mx3fb: 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/20230803184034.6456-27-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -1927,9 +1927,7 @@ config FB_MX3
 	tristate "MX3 Framebuffer support"
 	depends on FB && MX3_IPU
 	select BACKLIGHT_CLASS_DEVICE
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	default y
 	help
 	  This is a framebuffer device for the i.MX31 LCD Controller. So

drivers/video/fbdev/mx3fb.c

@@ -1247,13 +1247,11 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var,
  */
 static const struct fb_ops mx3fb_ops = {
 	.owner = THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_set_par = mx3fb_set_par,
 	.fb_check_var = mx3fb_check_var,
 	.fb_setcolreg = mx3fb_setcolreg,
 	.fb_pan_display = mx3fb_pan_display,
-	.fb_fillrect = cfb_fillrect,
-	.fb_copyarea = cfb_copyarea,
-	.fb_imageblit = cfb_imageblit,
 	.fb_blank = mx3fb_blank,
 };