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/inventory/phosphor-inventory-manager_git.bb b/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager_git.bb
index 576185a..d72c12d 100644
--- a/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager_git.bb
+++ b/meta-phosphor/recipes-phosphor/inventory/phosphor-inventory-manager_git.bb
@@ -22,7 +22,7 @@
         sdbusplus \
         sdbusplus-native \
         autoconf-archive-native \
-        cereal \
+        libcereal \
         "
 RDEPENDS_${PN} += " \
         sdbusplus \