meta-phosphor: Add nholmann JSON dependency

(From meta-phosphor rev: b9d88f84b494d7e2a2d7ef2d30504dd07381dd66)

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I40b5f05f8245b78447d2211c2e9c14d3b738fa6e
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
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 9fdeea0..9b116d5 100644
--- a/meta-phosphor/recipes-phosphor/leds/phosphor-led-manager_git.bb
+++ b/meta-phosphor/recipes-phosphor/leds/phosphor-led-manager_git.bb
@@ -27,6 +27,7 @@
 DEPENDS += "sdbusplus ${PYTHON_PN}-sdbus++-native"
 DEPENDS += "systemd"
 DEPENDS += "phosphor-logging"
+DEPENDS += "nlohmann-json"
 
 DEPENDS += "virtual/${PN}-config-native"