rlcmac: support decode FDD_CELL_INFORMATION of "UTRAN FDD Description

Port of patch (+ later fixes squashed) of wireshark.git commit
dea5452b95dfaf18e38670a8e2b3b38f9175fdfd, from Lei Chen:
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6856

Squashed wireshark.git fix commits:
774be29de0b4d93d01aecb1518c41d7d551071a9
51c31cd7bd3d8fc196a9f90a8af466ad84e9e6a8
6aca10831f86c562970b13efa811f46e25ee3091
c1ceac58cdb77051e9bd14c1f6f7669cf5779a86

Change-Id: I08523bc1bbdffde479ef974b4c7b56cfa5639591
diff --git a/src/csn1.h b/src/csn1.h
index a637d57..d178ada 100644
--- a/src/csn1.h
+++ b/src/csn1.h
@@ -71,6 +71,8 @@
 } csnStream_t;
 
 typedef gint16 (*StreamSerializeFcn_t)(csnStream_t* ar, struct bitvec *vector, unsigned *readIndex, void* data);
+typedef CSN_CallBackStatus_t (*DissectorCallbackFcn_t)(struct bitvec *vector, unsigned *readIndex, void* param1, void* param2);
+
 typedef enum
 {
   CSN_END = 0,