PRD: allow getTargetPosition() on SYS target

The concept of a system position does not exist, however, we want
to allow generic code to get the target position for any target.
So we will add this special case.

Change-Id: I6327c935bed754126bb382e3092e24f981c6fab8
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/36049
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Benjamin J. Weisenbeck <bweisenb@us.ibm.com>
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/36076
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>

src/usr/diag/prdf/common/plat/prdfTargetServices.C

@@ -5,7 +5,7 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* Contributors Listed Below - COPYRIGHT 2016                             */
+/* Contributors Listed Below - COPYRIGHT 2016,2017                        */
 /* [+] International Business Machines Corp.                              */
 /*                                                                        */
 /*                                                                        */
@@ -1157,6 +1157,13 @@ uint32_t getTargetPosition( TARGETING::TargetHandle_t i_target )
             break;
         }
 
+        case CLASS_SYS: // system
+            // The concept of a system position does not exist, however, we want
+            // to allow generic code to get the target position for any target.
+            // So we will add this special case.
+            o_pos = 0;
+            break;
+
         case CLASS_LOGICAL_CARD: // DIMMs
             o_pos = i_target->getAttr<ATTR_FAPI_POS>();
             break;