Fix the travis CI compilation error seen for osx job

After the commit [1], travis CI job for osx [2] is failing with the below
error:

*****
In file included from lib/actions.c:25:
./lib/ovn-l7.h:246:9: error: 'ND_OPT_ROUTE_INFO' macro redefined [-Werror,-Wmacro-redefined]
        ^
/usr/include/netinet/icmp6.h:329:9: note: previous definition is here
*****

This patch renames the macro ND_OPT_ROUTE_INFO to ND_OPT_ROUTE_INFO_TYPE as this macro
is used to set the Route Information Option Type.

[1] - 9f7f466("Add support for Route Info Option in RA - RFC 4191")
[2] - https://travis-ci.org/ovn-org/ovn/jobs/634833728?utm_medium=notification&utm_source=github_status

Fixes- 9f7f466("Add support for Route Info Option in RA - RFC 4191")
CC: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Acked-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Numan Siddique <numans@ovn.org>

controller/pinctrl.c

@@ -2486,7 +2486,7 @@ packet_put_ra_route_info_opt(struct dp_packet *b, ovs_be32 lifetime,
         for (t1 = strtok_r(t0, "-", &r1), index = 0; t1;
              t1 = strtok_r(NULL, "-", &r1), index++) {
 
-            nd_rinfo.type = ND_OPT_ROUTE_INFO;
+            nd_rinfo.type = ND_OPT_ROUTE_INFO_TYPE;
             nd_rinfo.route_lifetime = lifetime;
 
             switch (index) {

lib/ovn-l7.h

@@ -243,10 +243,10 @@ struct ovs_nd_dnssl {
 BUILD_ASSERT_DECL(ND_DNSSL_OPT_LEN == sizeof(struct ovs_nd_dnssl));
 
 /* Route Information option RFC 4191 */
-#define ND_OPT_ROUTE_INFO       24
+#define ND_OPT_ROUTE_INFO_TYPE   24
 #define ND_ROUTE_INFO_OPT_LEN    8
 struct ovs_nd_route_info {
-    u_int8_t type;  /* ND_OPT_ROUTE_INFO */
+    u_int8_t type;  /* ND_OPT_ROUTE_INFO_TYPE */
     u_int8_t len;   /* 1, 2 or 3 */
     u_int8_t prefix_len;
     u_int8_t flags;