sysfb: Add struct sysfb_display_info

Add struct sysfb_display_info to wrap display-related state. For now
it contains only the screen's video mode. Later EDID will be added as
well.

This struct will be helpful for passing display state to sysfb drivers
or from the EFI stub library.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Richard Lyu <richard.lyu@suse.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

Author: tdz

include/linux/sysfb.h

@@ -8,6 +8,7 @@
  */
 
 #include <linux/err.h>
+#include <linux/screen_info.h>
 #include <linux/types.h>
 
 #include <linux/platform_data/simplefb.h>
@@ -60,6 +61,10 @@ struct efifb_dmi_info {
 	int flags;
 };
 
+struct sysfb_display_info {
+	struct screen_info screen;
+};
+
 #ifdef CONFIG_SYSFB
 
 void sysfb_disable(struct device *dev);