GPRS_Components: remove even more unused module imports

Change-Id: I25b1f1e02c95db0f0aed3867f814f9476d3c0d0d
diff --git a/pcu/GPRS_Components.ttcn b/pcu/GPRS_Components.ttcn
index 10618f4..9dd4650 100644
--- a/pcu/GPRS_Components.ttcn
+++ b/pcu/GPRS_Components.ttcn
@@ -25,13 +25,9 @@
 import from MobileL3_CommonIE_Types all;
 import from L3_Templates all;
 
-import from UD_Types all;
 import from PCUIF_Types all;
-import from PCUIF_CodecPort all;
 import from PCUIF_Components all;
-import from IPL4asp_Types all;
 import from Native_Functions all;
-import from SGSN_Components all;
 
 type record TsTrxBtsNum {
 	uint3_t		ts_nr,