Add counters: pcu.bts.N.pch.requests

Count attempted paging requests over PCH.

Related: SYS#4878
Change-Id: I1026780ef8542f40060b961df2f37213e15c29d7
diff --git a/src/gprs_rlcmac.cpp b/src/gprs_rlcmac.cpp
index 71849b8..ffa656c 100644
--- a/src/gprs_rlcmac.cpp
+++ b/src/gprs_rlcmac.cpp
@@ -47,6 +47,7 @@
 		LOGP(DRLCMAC, LOGL_ERROR, "TX: [PCU -> BTS] Failed to encode Paging Request\n");
 		return -1;
 	}
+	bts_do_rate_ctr_inc(bts, CTR_PCH_REQUESTS);
 	pcu_l1if_tx_pch(bts, paging_request, plen, pgroup);
 	bitvec_free(paging_request);