fbdev/xilinxfb: 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>
Cc: Michal Simek <michal.simek@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230803184034.6456-47-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -1742,9 +1742,7 @@ config FB_PS3_DEFAULT_SIZE_M
 config FB_XILINX
 	tristate "Xilinx frame buffer support"
 	depends on FB && (MICROBLAZE || ARCH_ZYNQ || ARCH_ZYNQMP)
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	help
 	  Include support for the Xilinx ML300/ML403 reference design
 	  framebuffer. ML300 carries a 640*480 LCD display on the board,

drivers/video/fbdev/xilinxfb.c

@@ -251,11 +251,9 @@ xilinx_fb_blank(int blank_mode, struct fb_info *fbi)
 
 static const struct fb_ops xilinxfb_ops = {
 	.owner			= THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_setcolreg		= xilinx_fb_setcolreg,
 	.fb_blank		= xilinx_fb_blank,
-	.fb_fillrect		= cfb_fillrect,
-	.fb_copyarea		= cfb_copyarea,
-	.fb_imageblit		= cfb_imageblit,
 };
 
 /* ---------------------------------------------------------------------