[TIPC] Updated link priority macros

Added macros for min/default/max link priority in tipc_config.h.
Also renamed TIPC_NUM_LINK_PRI to TIPC_MEDIA_LINK_PRI since that
is a more accurate description of what it is used for.

Signed-off-by: Per Liden <per.liden@ericsson.com>
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 9713d62..af9743a 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -82,7 +82,7 @@
 	struct bearer bearer;
 	struct media media;
 	struct bcbearer_pair bpairs[MAX_BEARERS];
-	struct bcbearer_pair bpairs_temp[TIPC_NUM_LINK_PRI];
+	struct bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1];
 };
 
 /**
@@ -630,7 +630,7 @@
 	bp_curr = bcbearer->bpairs;
 	memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs));
 
-	for (pri = (TIPC_NUM_LINK_PRI - 1); pri >= 0; pri--) {
+	for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) {
 
 		if (!bp_temp[pri].primary)
 			continue;