PRD: typo in runtime DRAM sparing signature

Change-Id: I8d52d76c993086e7ec6b090e91a8f87b8a03b1fa
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/59976
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Matt Derksen <mderkse1@us.ibm.com>
Reviewed-by: Caleb N. Palmer <cnpalmer@us.ibm.com>
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/60134
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>

src/usr/diag/prdf/plat/mem/prdfMemDsd_rt.C

@@ -237,7 +237,7 @@ uint32_t DsdEvent<TYPE_MBA>::startNextPhase( STEP_CODE_DATA_STRUCT & io_sc )
         {
             case TD_PHASE_0:
                 iv_phase  = TD_PHASE_1;
-                signature = PRDFSIG_StartVcmPhase1;
+                signature = PRDFSIG_StartDsdPhase1;
                 break;
 
             default: PRDF_ASSERT( false ); // invalid phase