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

Count attempted paging requests over PCH.

Related: SYS#4878
Change-Id: I1026780ef8542f40060b961df2f37213e15c29d7
diff --git a/src/bts.cpp b/src/bts.cpp
index ee6b915..4e3b770 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -132,8 +132,9 @@
 	{ "llc:scheduled",		"Scheduled Frames     "},
 	{ "llc:dl_bytes",               "RLC encapsulated PDUs"},
 	{ "llc:ul_bytes",               "full PDUs received   "},
-	{ "rach:requests",		"RACH requests        "},
-	{ "11bit_rach:requests",	"11BIT_RACH requests  "},
+	{ "pch:requests",		"PCH requests sent    "},
+	{ "rach:requests",		"RACH requests received"},
+	{ "11bit_rach:requests",	"11BIT_RACH requests received"},
 	{ "spb:uplink_first_segment",   "First seg of UL SPB  "},
 	{ "spb:uplink_second_segment",  "Second seg of UL SPB "},
 	{ "spb:downlink_first_segment", "First seg of DL SPB  "},