Only call PRD attention handling in resetPMComplex function at runtime.

HB can't call PRD handling after istep 16.4.  If this util function
happens to be called after that istep but before runtime, we may see
some unwanted PRD errors.

Change-Id: Ie4f9a55fe1e74f7835d9f30531b757a79d36b14e
CQ:SW448154
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/69138
Reviewed-by: Thi N. Tran <thi@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/usr/isteps/pm/pm_common.C

@@ -917,6 +917,26 @@ namespace HBPM
                 break;
             }
 
+            TRACFCOMP( ISTEPS_TRACE::g_trac_isteps_trace,
+                       "resetPMComplex: p9_pm_init(PM_RESET) succeeded "
+                       "HUID=0x%08X", get_huid(i_target) );
+
+#ifdef __HOSTBOOT_RUNTIME
+
+            // Explicitly call ATTN before exiting to ensure PRD handles
+            // LFIR before TMGT triggers PM Complex Init
+            l_errl = Singleton<ATTN::Service>::instance().
+                        handleAttentions( i_target );
+            if(l_errl)
+            {
+                TRACFCOMP(ISTEPS_TRACE::g_trac_isteps_trace,
+                          ERR_MRK"resetPmComplex: service::handleAttentions "
+                          "returned error for RtProc: 0x%08X", get_huid(i_target));
+                break;
+            }
+
+#endif
+
         } while(0);
 
         if ((TARGETING::is_phyp_load()) && (nullptr != l_homerVAddr))