fbdev: Clean up include statements in header file

Include mutex.h, printk.h and types.h, remove several unnecessary
include statements, and sort the list alphabetically.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240219093941.3684-10-tzimmermann@suse.de

include/linux/fb.h

@@ -2,15 +2,15 @@
 #ifndef _LINUX_FB_H
 #define _LINUX_FB_H
 
-#include <linux/refcount.h>
-#include <linux/kgdb.h>
 #include <uapi/linux/fb.h>
 
 #define FBIO_CURSOR            _IOWR('F', 0x08, struct fb_cursor_user)
 
-#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/printk.h>
+#include <linux/refcount.h>
+#include <linux/types.h>
 #include <linux/workqueue.h>
-#include <linux/list.h>
 
 #include <asm/fb.h>