Add counter for successful contention resolution procedures

This counter is related to succPDTCHSeizures,
(3GPP TS 52.402 B.2.1.51 Successful PDTCH seizures).

The relevant event when the first RLC block on the PDCH from the MS is
received is the fact that contention resolution is considered as done in
the network side. Hence, name the counter that way to ease
interpretation.

Related: SYS#4878
Change-Id: I3d67e3e68907921b43f2ca4398ad9578c0b2618c
diff --git a/src/bts.cpp b/src/bts.cpp
index d053396..2dc8ffb 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -147,6 +147,7 @@
 	{ "immediate:assignment_UL",	"Immediate Assign UL  "},
 	{ "immediate:assignment_ul:one_phase",	"Immediate Assign UL (one phase packet access)"}, /* TS 52.402 B.2.1.50 */
 	{ "immediate:assignment_ul:two_phase",	"Immediate Assign UL (two phase packet access)"}, /* TS 52.402 B.2.1.50 */
+	{ "immediate:assignment_ul:contention_resolution_success", "First RLC Block (PDU) on the PDTCH from the MS received"}, /* TS 52.402 B.2.1.51 */
 	{ "immediate:assignment_rej",   "Immediate Assign Rej "},
 	{ "immediate:assignment_DL",	"Immediate Assign DL  "},
 	{ "channel:request_description","Channel Request Desc "},