Handle extremely large ATTR in ATTR dump tool

  - ATTR_WOF_TABLE_DATA is 128K, dump tool used
    the stack for local buffer space and this
    ATTR exceeded stack space.  Changed to use realloc

Change-Id: Icbdc7c397507ce4244cce1c04171a49e0f6bcb68
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/40989
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: William G. Hoffa <wghoffa@us.ibm.com>
Reviewed-by: Prachi Gupta <pragupta@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/usr/fapi2/plat_attr_override_sync.C

@@ -675,6 +675,8 @@ void AttrOverrideSync::setAttrActions(const AttributeId i_attrId,
 //******************************************************************************
 void AttrOverrideSync::triggerAttrSync()
 {
+    uint8_t * l_buf = NULL;
+
     //Walk through all HB targets and see if there is a matching FAPI target
     //If so then get the list of ATTR for FAPI target and add to sync list
     for (TARGETING::TargetIterator target = TARGETING::targetService().begin();
@@ -735,7 +737,7 @@ void AttrOverrideSync::triggerAttrSync()
               l_attrs[i].iv_dims[3];
 
             //Get the data
-            uint8_t l_buf[l_bytes];
+            l_buf = reinterpret_cast<uint8_t *>(realloc(l_buf, l_bytes));
             ReturnCode l_rc =
               rawAccessAttr(
                         static_cast<fapi2::AttributeId>(l_attrs[i].iv_attrId),
@@ -751,6 +753,8 @@ void AttrOverrideSync::triggerAttrSync()
         }
     }
 
+    free(l_buf);
+
     //Now push the data to the debug tool
     sendFapiAttrSyncs();
 }