phosphor-led-manager: Add libcereal

ledmanager already depends on libcereal in meson. This commit adds a
dependency on the cereal repository in the bb file.

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I8b3ea3afb0e95afd9f27814966566205f260cf63
diff --git a/meta-phosphor/recipes-phosphor/leds/phosphor-led-manager_git.bb b/meta-phosphor/recipes-phosphor/leds/phosphor-led-manager_git.bb
index 3c427f6..4a571a7 100644
--- a/meta-phosphor/recipes-phosphor/leds/phosphor-led-manager_git.bb
+++ b/meta-phosphor/recipes-phosphor/leds/phosphor-led-manager_git.bb
@@ -4,6 +4,7 @@
 DEPENDS += "${PYTHON_PN}-pyyaml-native"
 DEPENDS += "${PYTHON_PN}-inflection-native"
 DEPENDS += "cli11"
+DEPENDS += "libcereal"
 DEPENDS += "nlohmann-json"
 DEPENDS += "phosphor-logging"
 DEPENDS += "sdbusplus ${PYTHON_PN}-sdbus++-native"