L2 BVI/FIB: Update L2 FIB table when BVI's MAC changes

also some moving of l2 headers to reduce dependencies

Change-Id: I7a700a411a91451ef13fd65f9c90de2432b793bb
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/l2/l2_fib.c b/src/vnet/l2/l2_fib.c
index 60d0db5..dcfee7b 100644
--- a/src/vnet/l2/l2_fib.c
+++ b/src/vnet/l2/l2_fib.c
@@ -376,7 +376,7 @@
  * If the entry already exists then overwrite it
  */
 void
-l2fib_add_entry (u8 * mac, u32 bd_index,
+l2fib_add_entry (const u8 * mac, u32 bd_index,
 		 u32 sw_if_index, l2fib_entry_result_flags_t flags)
 {
   l2fib_entry_key_t key;
@@ -660,7 +660,7 @@
  * sw_if_index is non-zero and does not match that in the entry.
  */
 u32
-l2fib_del_entry (u8 * mac, u32 bd_index, u32 sw_if_index)
+l2fib_del_entry (const u8 * mac, u32 bd_index, u32 sw_if_index)
 {
   l2fib_entry_result_t result;
   l2fib_main_t *mp = &l2fib_main;