Add new next hop group attribute to specify if a next hop group is programmed

by repeating the next hop members in proportion to their weight
or by using the intrinsic next hop group weight support in the hardware.

Signed-off-by: Kishore Gummadidala <kishorg@google.com>

Author: Kishore Gummadidala

inc/sainexthopgroup.h

@@ -299,6 +299,17 @@ typedef enum _sai_next_hop_group_attr_t
      */
     SAI_NEXT_HOP_GROUP_ATTR_LABEL,
 
+    /**
+     * @brief Weighted multi path configuration mode.
+     * false: Nexthop group is programmed with repeated member entries proportional to their weight
+     * true: Nexthop group is programmed with switch native configuration
+     *
+     * @type bool
+     * @flags CREATE_AND_SET
+     * @default false
+     */
+    SAI_NEXT_HOP_GROUP_ATTR_NATIVE_WCMP,
+
     /**
      * @brief End of attributes
      */