batman-adv: add bridge loop avoidance compile option

The define CONFIG_BATMAN_ADV_BLA switches the bridge loop avoidance
on - skip it, and the bridge loop avoidance is not compiled in.

This is useful if binary size should be saved or the feature is
not needed.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

diff --cc net/batman-adv/Kconfig
Simple merge

diff --cc net/batman-adv/Makefile
Simple merge

diff --cc net/batman-adv/bat_debugfs.c
Simple merge

diff --cc net/batman-adv/bat_sysfs.c
Simple merge

diff --cc net/batman-adv/bridge_loop_avoidance.h
Simple merge

diff --cc net/batman-adv/soft-interface.c
Simple merge

diff --cc net/batman-adv/types.h
Simple merge