move some key types from GSM_RR_Types to GSM_Types

This in turn means Osmocom_Gb_Types doesn't need to depend on
GSM_RR_Types anymore, which is particularly ugly as the latter
now depends on RLCMAC_*, creating a long chain of dependencies.

Change-Id: I8c8da7709695ff0023f71b3999291e2515b22e46
diff --git a/sgsn/SGSN_Tests.ttcn b/sgsn/SGSN_Tests.ttcn
index 0e656a3..ec18b53 100644
--- a/sgsn/SGSN_Tests.ttcn
+++ b/sgsn/SGSN_Tests.ttcn
@@ -15,6 +15,7 @@
 
 import from General_Types all;
 import from Osmocom_Types all;
+import from GSM_Types all;
 import from Native_Functions all;
 import from NS_Types all;
 import from NS_Emulation all;