PCUIF_Types: add decoder for PCUIF_pch_dt

An encoder function enc_PCUIF_pch_dt exists, but we do not have a
decoder yet.

Related: OS#5927
Change-Id: I535aa45a676b87a8912e99bdb802bf29a23f1c89
diff --git a/library/PCUIF_Types.ttcn b/library/PCUIF_Types.ttcn
index 65d0c41..94056b9 100644
--- a/library/PCUIF_Types.ttcn
+++ b/library/PCUIF_Types.ttcn
@@ -326,6 +326,8 @@
 
 external function enc_PCUIF_pch_dt(in PCUIF_pch_dt pdu) return octetstring
 	with { extension "prototype(convert) encode(RAW)" };
+external function dec_PCUIF_pch_dt(in octetstring stream) return PCUIF_pch_dt
+	with { extension "prototype(convert) decode(RAW)" };
 
 type union PCUIF_MsgUnion {
 	PCUIF_data		data_req,