Updated genHwsvMrwXml script for VRM power on.
Updated genHwsvMrwXml script for VRM power on.

Moved domains to mcbist from membuf targets.
Added in some defaults for some attributes.

Change-Id: I789a260158b58285408f6e2c4a0e69d2f07c0f1d
RTC:152994
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/27089
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Reviewed-by: Martin Gloff <df0a4963746ae04ab678d064fccc7ee68adfd751@us.ibm.com>
Tested-by: FSP CI Jenkins <aa9e4d9ac7cd25905e9c0dd36d4150516e73dd86@us.ibm.com>
Reviewed-by: Christian R. Geddes <f397583a9caa8163a06ad1128784fb67413f2fe6@us.ibm.com>
Reviewed-by: Andres A. Lugo-Reyes <1e80b37233adece4fe8991e4578aec38a057d106@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>

open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot