config/batman-adv: disable network coding

- added new (empty) config options
- disable network coding
- unified formatting

Signed-off-by: Tim Niemeyer <tim.niemeyer@mastersword.de>
Reviewed-by: Steffen Pankratz <kratz00@gmx.de>

bsp/default/root_file_system/etc/config/batman-adv

-config 'mesh' 'bat0'
-        option 'aggregated_ogms'  
-        option 'ap_isolation'     
-        option 'bonding'          
-        option 'fragmentation'    
-        option 'gw_bandwidth'     
-        option 'gw_mode' 'client'
-        option 'gw_sel_class' '1'
-        option 'log_level'              
-        option 'orig_interval'               
-        option 'vis_mode'                       
-        option 'bridge_loop_avoidance' '0'
\ No newline at end of file
+config mesh bat0
+    option aggregated_ogms
+    option ap_isolation
+    option bonding
+    option fragmentation
+    option gw_bandwidth
+    option gw_mode client
+    option gw_sel_class 1
+    option log_level
+    option orig_interval
+    option vis_mode
+    option bridge_loop_avoidance 0
+    option distributed_arp_table
+    option network_coding 0
+    option hop_penalty