misc: Break the big IP header files to improve compile time

Type: refactor

Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
Change-Id: Id1801519638a9b97175847d7ed58824fb83433d6
diff --git a/src/vnet/bier/bier_imp_node.c b/src/vnet/bier/bier_imp_node.c
index 8b20325..fc75cb2 100644
--- a/src/vnet/bier/bier_imp_node.c
+++ b/src/vnet/bier/bier_imp_node.c
@@ -15,7 +15,8 @@
 
 #include <vnet/bier/bier_imp.h>
 #include <vnet/bier/bier_hdr_inlines.h>
-#include <vnet/ip/ip.h>
+#include <vnet/ip/ip4_inlines.h>
+#include <vnet/ip/ip6_inlines.h>
 
 /**
  * @brief A struct to hold tracing information for the BIER imposition