fbdev/pmag-aa-fb: 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/20230803184034.6456-32-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -1519,9 +1519,7 @@ config FB_HIT
 config FB_PMAG_AA
 	tristate "PMAG-AA TURBOchannel framebuffer support"
 	depends on FB && TC
-	select FB_CFB_FILLRECT
-	select FB_CFB_COPYAREA
-	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_HELPERS
 	help
 	  Support for the PMAG-AA TURBOchannel framebuffer card (1280x1024x1)
 	  used mainly in the MIPS-based DECstation series.

drivers/video/fbdev/pmag-aa-fb.c

@@ -149,10 +149,8 @@ static int aafb_blank(int blank, struct fb_info *info)
 
 static const struct fb_ops aafb_ops = {
 	.owner		= THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_blank	= aafb_blank,
-	.fb_fillrect	= cfb_fillrect,
-	.fb_copyarea	= cfb_copyarea,
-	.fb_imageblit	= cfb_imageblit,
 	.fb_cursor	= aafb_cursor,
 };