batman-adv: Introduce missing headers for genetlink restructure

Fixes: 56989f6 ("genetlink: mark families as __ro_after_init")
Fixes: 2ae0f17 ("genetlink: use idr to track families")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

Author: ecsv

net/batman-adv/netlink.c

@@ -20,11 +20,14 @@
 
 #include <linux/atomic.h>
 #include <linux/byteorder/generic.h>
+#include <linux/cache.h>
 #include <linux/errno.h>
+#include <linux/export.h>
 #include <linux/fs.h>
 #include <linux/genetlink.h>
 #include <linux/if_ether.h>
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/netlink.h>
 #include <linux/printk.h>