Maintain opcg_reg1 SCAN_CLK_USE_EVEN in p9_putRingUtils.C

Use putScomUnderMask.

Change-Id: I85de10c1f0afee4e8b571a81bc2e50464ae680f5
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/41764
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Reviewed-by: RANGANATHPRASAD G. BRAHMASAMUDRA <prasadbgr@in.ibm.com>
Reviewed-by: Thi N. Tran <thi@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/41771
Reviewed-by: Hostboot Team <hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>

src/import/chips/p9/utils/p9_putRingUtils.C

@@ -747,9 +747,12 @@ fapi2::ReturnCode setupScanRegionForSetPulse(
         // Add the chiplet ID in the Scom Address
         l_scomAddress |= l_chiplet;
 
+        // Maintain SCAN_CLK_USE_EVEN bit 49
+        fapi2::buffer<uint64_t> l_opcgReg1Mask(0xFFFFFFFFFFFFBFFFull);
+
         fapi2::buffer<uint64_t> l_opcgReg1(l_opcg_reg1);
 
-        l_rc = fapi2::putScom(l_parent, l_scomAddress, l_opcgReg1);
+        l_rc = fapi2::putScomUnderMask(l_parent, l_scomAddress, l_opcgReg1, l_opcgReg1Mask);
 
         if(l_rc != fapi2::FAPI2_RC_SUCCESS)
         {