suites: gprs: Add test to verify CS paging works while MS is GPRS attached

Related: OS#2204
Change-Id: If2844d78b52eda59c1f6d9e18363b858f2b5f007
diff --git a/suites/gprs/suite.conf b/suites/gprs/suite.conf
index 3d4fe48..d40c1e5 100644
--- a/suites/gprs/suite.conf
+++ b/suites/gprs/suite.conf
@@ -4,6 +4,10 @@
   bts:
   - times: 1
   modem:
-  - times: 4
+  - times: 2
+    features:
+    - gprs
+    - voice
+  - times: 2
     features:
     - gprs