add codec_mapping.h,c

Converting between different codec representations is confusing. This
codec mapping provides a consolidated overview of all our codec
representations, and how they match up.

In particular, it adds the SDP codec representation repertoire,
preparing the use of full SDP on the MNCC interface.

Related: SYS#5066
Change-Id: Iaa307be6a8487aa8d4ba7cd59d5c5ef04818a744
diff --git a/src/libmsc/Makefile.am b/src/libmsc/Makefile.am
index de02a17..c7fe4bb 100644
--- a/src/libmsc/Makefile.am
+++ b/src/libmsc/Makefile.am
@@ -27,6 +27,7 @@
 libmsc_a_SOURCES = \
 	call_leg.c \
 	cell_id_list.c \
+	codec_mapping.c \
 	sccp_ran.c \
 	msc_vty.c \
 	db.c \