Remove default build of some image types

Remove the building by default of cpios and squashfs images.

The cpio isn't used at all.  Allow the squashfs image to be
build via dependency (overlay).

Change-Id: I03372def60468cdca5a7084e1312e80f405758e7
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/conf/distro/openbmc-phosphor.conf b/meta-phosphor/conf/distro/openbmc-phosphor.conf
index b5c7dd8..9f8bad2 100644
--- a/meta-phosphor/conf/distro/openbmc-phosphor.conf
+++ b/meta-phosphor/conf/distro/openbmc-phosphor.conf
@@ -6,8 +6,6 @@
 DISTRO_VERSION = "0.1.0"
 TARGET_VENDOR="-openbmc"
 
-IMAGE_FSTYPES += "cpio.gz"
-IMAGE_FSTYPES += "squashfs-xz"
 IMAGE_LINGUAS = "en-us"
 
 VIRTUAL-RUNTIME_keymaps = ""