meta-phosphor: switch to meta-oe libcereal

A cereal recipe was added recently to meta-openembedded.  Use it so we
can deprecate our version of it.

(From meta-phosphor rev: cc51cd9910f3480cf4d2e0bff8aa6b95162e5bc1)

Change-Id: I7746dbd1eda3011b870b85770092b2d020800af7
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-phosphor/state/phosphor-state-manager.bb b/meta-phosphor/recipes-phosphor/state/phosphor-state-manager.bb
index 97d3dc7..2ec65c1 100644
--- a/meta-phosphor/recipes-phosphor/state/phosphor-state-manager.bb
+++ b/meta-phosphor/recipes-phosphor/state/phosphor-state-manager.bb
@@ -41,7 +41,7 @@
 DEPENDS += "sdeventplus"
 DEPENDS += "phosphor-logging"
 DEPENDS += "phosphor-dbus-interfaces"
-DEPENDS += "cereal"
+DEPENDS += "libcereal"
 RDEPENDS_${PN} += "sdbusplus"
 
 RDEPENDS_${PN}-host += "libsystemd phosphor-dbus-interfaces"