fbdev/sm712fb: Do not include <linux/screen_info.h>

Sm712fb's dependency on <linux/screen_info.h> is artificial in that
it only uses struct screen_info for its internals. Replace the use of
struct screen_info with a custom data structure and remove the include
of <linux/screen_info.h>.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Teddy Wang <teddy.wang@siliconmotion.com>
Cc: Helge Deller <deller@gmx.de>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230706104852.27451-3-tzimmermann@suse.de

drivers/video/fbdev/sm712fb.c

@@ -27,12 +27,17 @@
 #include <linux/uaccess.h>
 #include <linux/module.h>
 #include <linux/console.h>
-#include <linux/screen_info.h>
 
 #include <linux/pm.h>
 
 #include "sm712.h"
 
+struct smtcfb_screen_info {
+	u16 lfb_width;
+	u16 lfb_height;
+	u16 lfb_depth;
+};
+
 /*
  * Private structure
  */
@@ -829,7 +834,7 @@ static const struct modeinit vgamode[] = {
 	},
 };
 
-static struct screen_info smtc_scr_info;
+static struct smtcfb_screen_info smtc_scr_info;
 
 static char *mode_option;