Switch Rainier build to use 2s2u model

 Signed-off-by: Nick Bofferding <bofferdn@us.ibm.com>
diff --git a/openpower/configs/rainier_defconfig b/openpower/configs/rainier_defconfig
index 59095ad..1d17591 100644
--- a/openpower/configs/rainier_defconfig
+++ b/openpower/configs/rainier_defconfig
@@ -50,10 +50,10 @@
 BR2_OPENPOWER_MACHINE_XML_CUSTOM_GIT=y
 BR2_OPENPOWER_MACHINE_XML_CUSTOM_GIT_VALUE="git@github.ibm.com:openbmc/rainier-xml.git"
 BR2_OPENPOWER_MACHINE_XML_VERSION="2dc3999065846e5b9a03b1222341b4cbd557bd4c"
-BR2_OPENPOWER_MACHINE_XML_FILENAME="Rainier-4U-MRW.xml"
+BR2_OPENPOWER_MACHINE_XML_FILENAME="Rainier-2U-MRW.xml"
 BR2_OPENPOWER_SYSTEM_XML_FILENAME="RAINIER_hb.system.xml"
 BR2_OPENPOWER_MRW_XML_FILENAME="RAINIER_hb.mrw.xml"
-BR2_OPENPOWER_BIOS_XML_FILENAME="Rainier-4U-MRW_bios.xml"
+BR2_OPENPOWER_BIOS_XML_FILENAME="Rainier-2U-MRW_bios.xml"
 BR2_OPENPOWER_PNOR_XML_LAYOUT_FILENAME="defaultPnorLayout_64.xml"
 BR2_OPENPOWER_CONFIG_NAME="rainier"
 BR2_OPENPOWER_PNOR_FILENAME="rainier.pnor"