bts_pch_timer: Avoid resend Paging Request over PCUIF if T3113 is armed

Let's avoid flooding the BTS and taking CCCH resources for no good
reason. If user configures everything correctly, the SGSN should not
attempt a retry after similar timer >= T3113.

Related: OS#5297
Change-Id: I2a77714648d16ccff2a340ce775e83dcc5ffe707
diff --git a/src/bts.h b/src/bts.h
index 3f482c9..3a58c63 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -126,6 +126,7 @@
 	CTR_LLC_DL_BYTES,
 	CTR_LLC_UL_BYTES,
 	CTR_PCH_REQUESTS,
+	CTR_PCH_REQUESTS_ALREADY,
 	CTR_PCH_REQUESTS_TIMEDOUT,
 	CTR_RACH_REQUESTS,
 	CTR_RACH_REQUESTS_11BIT,