L2-input/output: use feature enum type in flag update function

Change-Id: I1f58f441c65fbca101bee2e864bfa6ae2306b475
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/l2/l2_input.h b/src/vnet/l2/l2_input.h
index e7c413f..f55e703 100644
--- a/src/vnet/l2/l2_input.h
+++ b/src/vnet/l2/l2_input.h
@@ -135,6 +135,7 @@
 /* Feature bit masks */
 typedef enum
 {
+  L2INPUT_FEAT_NONE = 0,
 #define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT),
   foreach_l2input_feat
 #undef _
@@ -194,7 +195,8 @@
 
 /* Enable (or disable) the feature in the bitmap for the given interface */
 u32 l2input_intf_bitmap_enable (u32 sw_if_index,
-				u32 feature_bitmap, u32 enable);
+				l2input_feat_masks_t feature_bitmap,
+				u32 enable);
 
 /* Sets modifies flags from a bridge domain */
 u32 l2input_set_bridge_features (u32 bd_index, u32 feat_mask, u32 feat_value);