HW417560 NCU master tlbie settings tuning

- Adjusted master tlbie timeout from 16->32 (250ms->500ms)
- Enabled tlbie stall mechanism by default

Change-Id: I20c6834f9be444ee2088dc45dd9a268e4c219371
Original-Change-Id: Ifcda75f42ba888ad5353c1d9b75d36e27d48dbda
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/44713
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: LUKE MURRAY <murrayl@us.ibm.com>
Reviewed-by: YUE DU <daviddu@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>

import/chips/p9/procedures/ppe_closed/sgpe/stop_gpe/p9_sgpe_stop.h

@@ -139,6 +139,7 @@ extern "C" {
 
 #define EX_NCU_MODE_REG          0x1001100A
 #define EX_NCU_MODE_REG2         0x1001100B
+#define EX_NCU_MODE_REG3         0x1001100C
 #define EX_NCU_STATUS_REG        0x1001100F
 
 #define EX_DRAM_REF_REG          0x1001180F