resources: update modems, sierra_3 replaced by a Gobi

Change-Id: I95832920a83ede29f314dfce23e1089729dcf3c7
diff --git a/selftest/real_suite/resources.conf b/selftest/real_suite/resources.conf
index 5fd77d2..bb6181f 100644
--- a/selftest/real_suite/resources.conf
+++ b/selftest/real_suite/resources.conf
@@ -69,12 +69,12 @@
   imsi: '901700000009029'
   ki: '00969E283349D354A8239E877F2E0866'
 
-- label: sierra_3
-  path: '/sierra_3'
-  imsi: '901700000009032'
-  ki: '2F70DCA43C45ACB97E947FDD0C7CA30A'
-
 - label: gobi_0
   path: '/gobi_0'
   imsi: '901700000009030'
   ki: 'BB70807226393CDBAC8DD3439FF54252'
+
+- label: gobi_3
+  path: '/sierra_3'
+  imsi: '901700000009032'
+  ki: '2F70DCA43C45ACB97E947FDD0C7CA30A'