pcu: Introduce tests for CS and PS paging from SGSN/Gb

CS Gb paging and PTP CS/PS paging implemented in osmo-pcu:
I9501e02e1d7f6944497e724dbccb9a19c3f5221f
I5c52b5af740460c48bb3ba858243b1d20e624268

Related: OS#3927, OS#2406
Change-Id: I90b5a792c1d91e38ea7b8c060ff0b459673df951
diff --git a/library/GSM_RR_Types.ttcn b/library/GSM_RR_Types.ttcn
index 965708f..f5eeda5 100644
--- a/library/GSM_RR_Types.ttcn
+++ b/library/GSM_RR_Types.ttcn
@@ -911,6 +911,22 @@
 		}
 	};
 
+	template GsmRrMessage tr_PAG_REQ1(template MobileIdentityLV mi1 := ?) := {
+		header := t_RrHeader(PAGING_REQUEST_TYPE_1, ?),
+		payload := {
+			pag_req_1 := {
+				chan_needed := {
+					second := ?,
+					first := ?
+				},
+				page_mode := PAGE_MODE_NORMAL,
+				mi1 := mi1,
+				mi2 := omit,
+				rest_octets := ?
+			}
+		}
+	};
+
 	template (value) GsmRrL3Message ts_MEAS_REP(boolean valid, uint6_t rxl_f, uint6_t rxl_s,
 						  uint3_t rxq_f, uint3_t rxq_s,
 						  template (omit) NcellReports reps) := {