Update pnor XML WOF description to say 6 MB

Forgot to update the description when we shrunk this down a few
weeks ago.

Change-Id: I08defc878135a031873955c7249808636d1d3e4d
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/76221
Reviewed-by: Ilya Smirnov <ismirno@us.ibm.com>
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>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Matt Derksen <mderkse1@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/build/buildpnor/pnorLayoutAxone.xml

@@ -233,7 +233,7 @@ Layout Description
         <ecc/>
     </section>
     <section>
-        <description>VFRT data for WOF (12MB)</description>
+        <description>VFRT data for WOF (6MB)</description>
         <!-- We need 266KB per module sort, going to support
              40 tables by default, plus ECC  -->
         <eyeCatch>WOFDATA</eyeCatch>