fbdev/sh7760fb: 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/20230803184034.6456-39-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -1778,9 +1778,7 @@ config FB_SH7760
 	bool "SH7760/SH7763/SH7720/SH7721 LCDC support"
 	depends on FB && (CPU_SUBTYPE_SH7760 || CPU_SUBTYPE_SH7763 \
 		|| CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721)
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	help
 	  Support for the SH7760/SH7763/SH7720/SH7721 integrated
 	  (D)STN/TFT LCD Controller.

drivers/video/fbdev/sh7760fb.c

@@ -345,13 +345,11 @@ static int sh7760fb_set_par(struct fb_info *info)
 
 static const struct fb_ops sh7760fb_ops = {
 	.owner = THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_blank = sh7760fb_blank,
 	.fb_check_var = sh7760fb_check_var,
 	.fb_setcolreg = sh7760_setcolreg,
 	.fb_set_par = sh7760fb_set_par,
-	.fb_fillrect = cfb_fillrect,
-	.fb_copyarea = cfb_copyarea,
-	.fb_imageblit = cfb_imageblit,
 };
 
 static void sh7760fb_free_mem(struct fb_info *info)