PRD: Dyn mem dealloc fix getting ocmb channel pos

Change-Id: I6b91ccbf8f30c9978a3db46f209965afd6fe1880
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/93631
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Benjamen G Tyner <ben.tyner@ibm.com>
Reviewed-by: Brian J Stegmiller <bjs@us.ibm.com>
Reviewed-by: Zane C Shelley <zshelle@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/93714
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>

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

@@ -1118,7 +1118,8 @@ uint32_t __insertGrpId<TYPE_OCMB_CHIP>( ExtensibleChip * i_chip,
     // subchannel select bit.
     if ( bothSubChansEnabled )
     {
-        uint8_t ocmbChnl = i_chip->getPos() % MAX_OCMB_PER_MCC; // 0:1
+        TargetHandle_t omi = getConnectedParent( i_chip->getTrgt(), TYPE_OMI );
+        uint8_t ocmbChnl = getTargetPosition(omi) % MAX_OMI_PER_MCC; // 0:1
         uint8_t bitInsert = 0;
 
         switch ( i_grpChnls )