Fix setting plid to the lastest one available at hbrt start

Had a bad check in code which caused all runtime errors
to restart at 0x90000001.  Need to mask off the first byte of
found plid to compare against ERRLOG_PLID_POST_MAX.

Change-Id: I34ab5b021270a22141415eb9d17682b59c393624
CQ:SW420777
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/55658
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Brian E. Bakke <bbakke@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/usr/errl/errlmanager_common.C

@@ -165,7 +165,8 @@ void ErrlManager::setupPnorInfo()
                 }
                 // if this is 'my' type of plid (HB or HBRT) see if it's max
                 if (((l_id & FIRST_BYTE_ERRLOG) == ERRLOG_PLID_BASE ) &&
-                    (l_id > l_maxId ) && (l_id <= ERRLOG_PLID_POST_MAX))
+                    (l_id > l_maxId ) &&
+                    ((l_id & ERRLOG_PLID_MASK) <= ERRLOG_PLID_POST_MAX))
                 {
                     l_maxId = l_id;