classify: Reduce the include dependencies on vnet_classify.h

Type: refactor

currently vnet_classify.h is included in ip.h where it's not required.

Change-Id: Id55682637601655aa2edda681536a979c8e323bd
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/fib/fib_api.c b/src/vnet/fib/fib_api.c
index 856271f..54cff92 100644
--- a/src/vnet/fib/fib_api.c
+++ b/src/vnet/fib/fib_api.c
@@ -21,6 +21,7 @@
 #include <vnet/mfib/mfib_table.h>
 #include <vnet/bier/bier_disp_table.h>
 #include <vpp/api/types.h>
+#include <vnet/classify/vnet_classify.h>
 
 #include <vnet/vnet_msg_enum.h>