fbcon: remove consw::con_screen_pos()

fbcon_screen_pos() performs the same as the default implementation. The
only difference in the default implementation is that is considers both
vc->vc_origin and vc->vc_visible_origin. But given fbcon's softscroll
code was already removed in commit 50145474 (fbcon: remove soft
scrollback code), both are always the same.

So remove fbcon_screen_pos() too.
Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-fbdev@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Tested-by: Helge Deller <deller@gmx.de> # parisc STI console
Link: https://lore.kernel.org/r/20240122110401.7289-40-jirislaby@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/video/fbdev/core/fbcon.c

@@ -2593,11 +2593,6 @@ static void fbcon_set_palette(struct vc_data *vc, const unsigned char *table)
 	fb_set_cmap(&palette_cmap, info);
 }
 
-static u16 *fbcon_screen_pos(const struct vc_data *vc, int offset)
-{
-	return (u16 *) (vc->vc_origin + offset);
-}
-
 static unsigned long fbcon_getxy(struct vc_data *vc, unsigned long pos,
 				 int *px, int *py)
 {
@@ -3162,7 +3157,6 @@ static const struct consw fb_con = {
 	.con_font_default	= fbcon_set_def_font,
 	.con_set_palette 	= fbcon_set_palette,
 	.con_invert_region 	= fbcon_invert_region,
-	.con_screen_pos 	= fbcon_screen_pos,
 	.con_getxy 		= fbcon_getxy,
 	.con_resize             = fbcon_resize,
 	.con_debug_enter	= fbcon_debug_enter,