recipes-connectivity: Fix network manager build

| checking for POLKIT... yes
| checking for NSS... no
| configure: error: Package requirements (nss) were not met:
|
| No package 'nss' found

NOTE: Executing RunQueue Tasks
ERROR: networkmanager-1.4.4-r0 do_package: SYSTEMD_SERVICE_networkmanager value NetworkManager.service does not exist
ERROR: networkmanager-1.4.4-r0 do_package: Function failed: systemd_populate_packages
ERROR: Logfile of failure stored in: /home/josouza/intel_aero/poky/build/tmp/work/corei7-64-poky-linux/networkmanager/1.4.4-r0/temp/log.do_package.971
ERROR: Task (/home/josouza/intel_aero/poky/../meta-openembedded/meta-oe/recipes-connectivity/networkmanager/networkmanager_1.4.4.bb:do_package) failed with exit code '1'

recipes-connectivity/networkmanager/networkmanager_%.bbappend

@@ -1,2 +1,5 @@
 PACKAGECONFIG += "modemmanager"
-PACKAGECONFIG += "ppp"
+PACKAGECONFIG += "ppp"
+
+DEPENDS += "nss"
+PACKAGECONFIG += "systemd"