Revert "bts: extend bts_chan_load to allow counting tch only"

This reverts commit 308cb0719dca3ba8eed1eff2a2124d44f34d9a28.

Problems in this commit:

openbsc/src/libbsc/chan_alloc.c:523:   case GSM_PCHAN_TCH_F_PDCH:
This is actually wrong, GSM_PCHAN_TCH_F_PDCH use ts->flags, not ts->dyn below
(due to historical reasons and could be unified).

560:   if (only_count_tch && !chan_is_tch(ts))
This has exactly one effect: it excludes GSM_PCHAN_TCH_F_PDCH when in PDCH
mode, because for all other PDCH (plain PDCH and TCH/F_TCH/H_PDCH in PDCH mode)
below ts_subslots() returns 0 and skips the for() loop. I consider this a bug
in TCH/F_PDCH, to be fixed in an upcoming commit.

I don't see why we need the only_count_tch argument, because this should
normally only count TCH, weren't it for the TCH/F_PDCH bug.

If dyn TS should be counted differently, we should do this in a different way.

Change-Id: I34dbbaf53a800115e3d03bd44028cad675f3b525
diff --git a/openbsc/src/libbsc/paging.c b/openbsc/src/libbsc/paging.c
index e3795b3..fcb4deb 100644
--- a/openbsc/src/libbsc/paging.c
+++ b/openbsc/src/libbsc/paging.c
@@ -119,7 +119,7 @@
 	int count;
 
 	memset(&pl, 0, sizeof(pl));
-	bts_chan_load(&pl, bts, 0);
+	bts_chan_load(&pl, bts);
 
 	switch (rsl_type) {
 	case RSL_CHANNEED_TCH_F: