Only build FIT kernel images

U-Boot has support for FIT images enabled.  Yocto has been building both
cuImage and fitImage for a while now.  Dropping cuImage gets us closer
to mainline Yocto.  Using a FIT image clears the path for bundling the
initramfs into the kernel image.

Change-Id: I46f1e3d4196bab12b733c59efca40e9e50ca264d
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 657e54f..99855ca 100644
--- a/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
+++ b/meta-phosphor/conf/machine/include/obmc-bsp-common.inc
@@ -5,8 +5,8 @@
 MACHINE_EXTRA_RRECOMMENDS = " kernel-modules"
 EXTRA_IMAGEDEPENDS += "u-boot"
 
-KERNEL_CLASSES ?= "kernel-uimage kernel-cuimage kernel-fitimage"
-KERNEL_IMAGETYPES ?= "cuImage fitImage"
+KERNEL_CLASSES ?= "kernel-fitimage"
+KERNEL_IMAGETYPES ?= "fitImage"
 KERNEL_EXTRA_ARGS += "LOADADDR=${UBOOT_ENTRYPOINT}"
 
 UBOOT_SUFFIX ?= "bin"