rm dup: use channel type names from libosmocore

In gsm_lchant_name(enum gsm_chan_t), use the gsm_chan_t_names value strings
from libosmocore instead of redefining the same strings. The list from
libosmocore is also more complete, including CCCH and PDTCH.

Add a todo comment to move to libosmocore.

In consequence, libosmogsm linkage needs to be added to osmo-bsc_mgcp,
mgcp_test, mgcp_transcoding_test and smpp_mirror, smpp_test.

Change-Id: If65ee7c0619cbc0acb0a15045bd5a969442c93cc
diff --git a/openbsc/src/utils/Makefile.am b/openbsc/src/utils/Makefile.am
index 4521130..5a2e2d2 100644
--- a/openbsc/src/utils/Makefile.am
+++ b/openbsc/src/utils/Makefile.am
@@ -27,7 +27,7 @@
 
 smpp_mirror_SOURCES = smpp_mirror.c
 smpp_mirror_LDADD = $(top_builddir)/src/libcommon/libcommon.a \
-		    $(LIBOSMOCORE_LIBS) $(LIBSMPP34_LIBS)
+		    $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) $(LIBSMPP34_LIBS)
 
 meas_vis_SOURCES = meas_vis.c
 meas_vis_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) -lcdk -lncurses