ns2: Add a rate_ctr for each NS-UNBLOCK

We have one for BLOCK, so let's also add one for UNBLOCK.

Change-Id: I693109b7bc4d72b6803b40aae15327389aa37c69
diff --git a/src/gb/gprs_ns2.c b/src/gb/gprs_ns2.c
index 0f65d37..d4d215c 100644
--- a/src/gb/gprs_ns2.c
+++ b/src/gb/gprs_ns2.c
@@ -167,6 +167,7 @@
 	[NS_CTR_BYTES_OUT]	= { "bytes:out",	"Bytes at NS Level    (Out)" },
 	[NS_CTR_BYTES_OUT_DROP]	= { "bytes:out:drop",	"Dropped Bytes        (Out)" },
 	[NS_CTR_BLOCKED]	= { "blocked",		"NS-VC Block count         " },
+	[NS_CTR_UNBLOCKED]	= { "unblocked",	"NS-VC Unblock count       " },
 	[NS_CTR_DEAD] 		= { "dead",		"NS-VC gone dead count     " },
 	[NS_CTR_REPLACED]	= { "replaced",		"NS-VC replaced other count" },
 	[NS_CTR_NSEI_CHG]	= { "nsei-chg",		"NS-VC changed NSEI count  " },