Get interleave_enable from ZZ MRW

The tag name changed at some point, updating our parser to
reflect that.

Change-Id: Ia712f149fe05fd9615636155ce31596b35b90613
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/37807
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Martin Gloff <mgloff@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

Author: dcrowell77

src/usr/targeting/common/genHwsvMrwXml.pl

@@ -460,10 +460,10 @@
 
 # Note - if below attribute is specified with im-id, it will not get
 #  set into the output
-if( exists $reqPol->{'mss_interleave_enable'} )
+if( exists $reqPol->{'mss_mrw_interleave_enable'} )
 {
     push @systemAttr, ['MSS_INTERLEAVE_ENABLE',
-      $reqPol->{'mss_interleave_enable'}];
+      $reqPol->{'mss_mrw_interleave_enable'}];
 }