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.

Change-Id: I8345370d39c8c8e0faf73228c31d49a970435616
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/recipes-phosphor/settings/phosphor-settings-manager_git.bb b/recipes-phosphor/settings/phosphor-settings-manager_git.bb
index a63a1f2..4397e2d 100644
--- a/recipes-phosphor/settings/phosphor-settings-manager_git.bb
+++ b/recipes-phosphor/settings/phosphor-settings-manager_git.bb
@@ -20,7 +20,7 @@
 DEPENDS += "sdbusplus sdbusplus-native"
 DEPENDS += "phosphor-dbus-interfaces phosphor-dbus-interfaces-native"
 DEPENDS += "phosphor-logging"
-DEPENDS += "cereal"
+DEPENDS += "libcereal"
 
 RDEPENDS_${PN} += "sdbusplus phosphor-dbus-interfaces"