Launch netmgrd for the device with modem

1. Netmgrd is necessary for the device with modem to establish data connection.
2. Remove system.prop since it is not used.

Change-Id: I12fe0302e3034d55e9498e3de4ab5393d069b476
diff --git a/init.flo.rc b/init.flo.rc
index 42339bf..9fb0e35 100644
--- a/init.flo.rc
+++ b/init.flo.rc
@@ -446,6 +446,7 @@
 
 on property:ro.boot.baseband=mdm
     start qmuxd
+    start netmgrd
 
 on property:ro.boot.baseband=apq
     setprop ro.radio.noril yes