batman-adv: Add function to calculate crc32c for the skb payload

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
diff --git a/net/batman-adv/Kconfig b/net/batman-adv/Kconfig
index 250e0b5..8d8afb1 100644
--- a/net/batman-adv/Kconfig
+++ b/net/batman-adv/Kconfig
@@ -6,6 +6,7 @@
 	tristate "B.A.T.M.A.N. Advanced Meshing Protocol"
 	depends on NET
 	select CRC16
+	select LIBCRC32C
         default n
 	help
           B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is