Build FIT images that include an initramfs

All the infrastructure is provided by upstream Yocto. The resulting FIT
image includes (kernel+fdt+initramfs).  This can replace image-overlay's
manual inclusion of an initramfs in the flash image.

Change-Id: I6f3580c5e564539960e287a9fae3161cb425a534
Signed-off-by: Rick Altherr <raltherr@google.com>
diff --git a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
index fb68f31..f2c9247 100644
--- a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
+++ b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
@@ -20,7 +20,8 @@
 IMAGE_CLASSES += "image_types_uboot"
 
 INITRAMFS_CTYPE ?= "lzma"
-INITRAMFS_FSTYPES += "cpio.${INITRAMFS_CTYPE}.u-boot"
+INITRAMFS_FSTYPES += "cpio.${INITRAMFS_CTYPE} cpio.${INITRAMFS_CTYPE}.u-boot"
+INITRAMFS_IMAGE = "obmc-phosphor-initramfs"
 
 MACHINE_FEATURES_BACKFILL_CONSIDERED = "qemu-usermode"