fbdev/g364fb: 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/20230803184034.6456-13-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -1577,9 +1577,7 @@ config FB_MAXINE
 config FB_G364
 	bool "G364 frame buffer support"
 	depends on (FB = y) && (MIPS_MAGNUM_4000 || OLIVETTI_M700)
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	help
 	  The G364 driver is the framebuffer used in MIPS Magnum 4000 and
 	  Olivetti M700-10 systems.

drivers/video/fbdev/g364fb.c

@@ -112,12 +112,10 @@ static int g364fb_blank(int blank, struct fb_info *info);
 
 static const struct fb_ops g364fb_ops = {
 	.owner		= THIS_MODULE,
+	FB_DEFAULT_IOMEM_HELPERS,
 	.fb_setcolreg	= g364fb_setcolreg,
 	.fb_pan_display	= g364fb_pan_display,
 	.fb_blank	= g364fb_blank,
-	.fb_fillrect	= cfb_fillrect,
-	.fb_copyarea	= cfb_copyarea,
-	.fb_imageblit	= cfb_imageblit,
 };
 
 /*