n_tty: Cleanup includes

n_tty uses:
	- bitmap_zero() from linux/bitmap.h
	- EXPORT_SYMBOL_GPL() from linux/export.h
	- jiffies, time_after() from linux/jiffies.h

Add includes.

n_tty uses nothing from:
	- linux/audit.h
	- linux/interrupt.h
	- linux/major.h
	- linux/mm.h
	- linux/module.h
	- linux/timer.h

Remove those includes.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230309082035.14880-7-ilpo.jarvinen@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/n_tty.c

@@ -28,24 +28,21 @@
  *		EAGAIN
  */
 
-#include <linux/audit.h>
+#include <linux/bitmap.h>
 #include <linux/bitops.h>
 #include <linux/ctype.h>
 #include <linux/errno.h>
+#include <linux/export.h>
 #include <linux/fcntl.h>
 #include <linux/file.h>
-#include <linux/interrupt.h>
-#include <linux/major.h>
+#include <linux/jiffies.h>
 #include <linux/math.h>
-#include <linux/mm.h>
-#include <linux/module.h>
 #include <linux/poll.h>
 #include <linux/ratelimit.h>
 #include <linux/sched.h>
 #include <linux/signal.h>
 #include <linux/slab.h>
 #include <linux/string.h>
-#include <linux/timer.h>
 #include <linux/tty.h>
 #include <linux/types.h>
 #include <linux/uaccess.h>