Enable nlohmann JSON Dependency for networkd

- This commit enables the nlohman JSON development header
  files for compiling the phosphor-netword service.

Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
Change-Id: Iaf558415689935c3cb6c6552de3de00e6d06e089
diff --git a/recipes-phosphor/network/phosphor-network_git.bb b/recipes-phosphor/network/phosphor-network_git.bb
index 3d44910..72f49a5 100644
--- a/recipes-phosphor/network/phosphor-network_git.bb
+++ b/recipes-phosphor/network/phosphor-network_git.bb
@@ -20,6 +20,7 @@
 DEPENDS += "phosphor-logging"
 DEPENDS += "libnl"
 DEPENDS += "stdplus"
+DEPENDS += "nlohmann-json"
 
 PACKAGECONFIG ??= "uboot-env"