Updates to generate witherspoon pnor successfully

    - Update witherspoon.mk to use processMrw and point to the latest xml
    - Update hostboot's witherspoon.config
    - Add patches for processMrw and dvpd fix
diff --git a/openpower/configs/hostboot/witherspoon.config b/openpower/configs/hostboot/witherspoon.config
index ff2a828..5e1197d 100755
--- a/openpower/configs/hostboot/witherspoon.config
+++ b/openpower/configs/hostboot/witherspoon.config
@@ -1,6 +1,7 @@
 # The Serial Flash Controller is the AST2400 BMC.
 set   SFC_IS_AST2500
-unset   BMC_DOES_SFC_INIT
+unset SFC_IS_AST2400
+unset BMC_DOES_SFC_INIT
 unset SFC_IS_IBM_DPSS
 set   ALLOW_MICRON_PNOR
 set   ALLOW_MACRONIX_PNOR