sr: SRv6 TEF behavior support

Adding support for the SRv6 TEF (Timestamp, Encapsulation and Forward) behavior defined in
draft-filsfils-spring-path-tracing (https://datatracker.ietf.org/doc/draft-filsfils-spring-path-tracing/).

Type: feature

Change-Id: I7f38b593147daf8d27af9c983448cf82947e5bed
Signed-off-by: Ahmed Abdelsalam <ahabdels@cisco.com>
diff --git a/src/vnet/srv6/sr.h b/src/vnet/srv6/sr.h
index 507f8df..02ccead 100644
--- a/src/vnet/srv6/sr.h
+++ b/src/vnet/srv6/sr.h
@@ -90,6 +90,7 @@
 /* SR policy types */
 #define SR_POLICY_TYPE_DEFAULT 0
 #define SR_POLICY_TYPE_SPRAY 1
+#define SR_POLICY_TYPE_TEF     2
 /**
  * @brief SR Policy
  */