Fix initrd load address

Using the same address as:
  http://github.com/facebook/openbmc
diff --git a/classes/obmc-phosphor-image_types_uboot.bbclass b/classes/obmc-phosphor-image_types_uboot.bbclass
index 6652f3b..835e890 100644
--- a/classes/obmc-phosphor-image_types_uboot.bbclass
+++ b/classes/obmc-phosphor-image_types_uboot.bbclass
@@ -9,7 +9,7 @@
         -d ${DEPLOY_DIR_IMAGE}/$1 ${DEPLOY_DIR_IMAGE}/$1.u-boot
 }
 
-INITRD_IMAGE_ENTRYPOINT ?= "0x42000000"
+INITRD_IMAGE_ENTRYPOINT ?= "0x40800000"
 INITRD_IMAGE_LOADADDRESS ?= "${INITRD_IMAGE_ENTRYPOINT}"
 
 FLASH_IMAGE_NAME ?= "flash-${MACHINE}-${DATETIME}"