DTX: bts-{sysmo,oc2g,lc15}: Print DEBUG messages about ONSET

We're printing DEBUG messages for all other DTX frames, but not for
ONSET.  This made me think that we never received any ONSET frames
when looking at log output.

Let's add ONSET for completeness.

Related: OS#5944
Change-Id: I9a1511d9929444cef96388492d907e8f3a082311
---
M src/osmo-bts-lc15/tch.c
M src/osmo-bts-oc2g/tch.c
M src/osmo-bts-sysmo/tch.c
3 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/src/osmo-bts-lc15/tch.c b/src/osmo-bts-lc15/tch.c
index 526b2dd..ff93c75 100644
--- a/src/osmo-bts-lc15/tch.c
+++ b/src/osmo-bts-lc15/tch.c
@@ -399,6 +399,8 @@
 		if (lchan->type != GSM_LCHAN_TCH_H &&
 		    lchan->type != GSM_LCHAN_TCH_F)
 			goto err_payload_match;
+		LOGPFN(DL1P, LOGL_DEBUG, data_ind->u32Fn, "DTX: received ONSET from L1 "
+		       "(%d bytes)\n", payload_len);
 		/* according to 3GPP TS 26.093 ONSET frames precede the first
 		   speech frame of a speech burst - set the marker for next RTP
 		   frame */
diff --git a/src/osmo-bts-oc2g/tch.c b/src/osmo-bts-oc2g/tch.c
index 09ee1e7..d039b5e 100644
--- a/src/osmo-bts-oc2g/tch.c
+++ b/src/osmo-bts-oc2g/tch.c
@@ -403,6 +403,8 @@
 		if (lchan->type != GSM_LCHAN_TCH_H &&
 		    lchan->type != GSM_LCHAN_TCH_F)
 			goto err_payload_match;
+		LOGPFN(DL1P, LOGL_DEBUG, data_ind->u32Fn, "DTX: received ONSET from L1 "
+		       "(%d bytes)\n", payload_len);
 		/* according to 3GPP TS 26.093 ONSET frames precede the first
 		   speech frame of a speech burst - set the marker for next RTP
 		   frame */
diff --git a/src/osmo-bts-sysmo/tch.c b/src/osmo-bts-sysmo/tch.c
index a390c8c..fc9af77 100644
--- a/src/osmo-bts-sysmo/tch.c
+++ b/src/osmo-bts-sysmo/tch.c
@@ -549,6 +549,8 @@
 		if (lchan->type != GSM_LCHAN_TCH_H &&
 		    lchan->type != GSM_LCHAN_TCH_F)
 			goto err_payload_match;
+		LOGPFN(DL1P, LOGL_DEBUG, data_ind->u32Fn, "DTX: received ONSET from L1 "
+		       "(%d bytes)\n", payload_len);
 		/* according to 3GPP TS 26.093 ONSET frames precede the first
 		   speech frame of a speech burst - set the marker for next RTP
 		   frame */

