network: Add a mapper dependency

phosphor-network does mapper queries at startup; ensure
mapper is running prior to start.

Change-Id: I888c7e2a6ecd52fb55287099dbfc4bf12f5392c9
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/common/recipes-phosphor/network/network/xyz.openbmc_project.Network.service b/common/recipes-phosphor/network/network/xyz.openbmc_project.Network.service
index 009efc7..01e3b17 100644
--- a/common/recipes-phosphor/network/network/xyz.openbmc_project.Network.service
+++ b/common/recipes-phosphor/network/network/xyz.openbmc_project.Network.service
@@ -1,5 +1,6 @@
 [Unit]
 Description=Phosphor Network Manager
+After=obmc-mapper.target
 
 [Service]
 ExecStart={sbindir}/phosphor-network-manager