batman-adv: Add includes for deprecation warning

The commit 00caf6a2 ("batman-adv: Mark debugfs functionality as
deprecated") introduced various messages to inform the user about the
deprecation of the debugfs based functionality. The messages also include
the context/task in which this problem was observed.

The datastructures and functions to access this information require special
headers. These should be included directly instead of depending on a more
complex and fragile include chain.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

net/batman-adv/debugfs.c

@@ -19,6 +19,7 @@
 #include "debugfs.h"
 #include "main.h"
 
+#include <asm/current.h>
 #include <linux/dcache.h>
 #include <linux/debugfs.h>
 #include <linux/err.h>
@@ -27,6 +28,7 @@
 #include <linux/fs.h>
 #include <linux/netdevice.h>
 #include <linux/printk.h>
+#include <linux/sched.h>
 #include <linux/seq_file.h>
 #include <linux/stat.h>
 #include <linux/stddef.h>