init.qcom.rc: Launch tftp_server process as root user.

The tftp_server daemon requires root privileges to open
the wakelock files and grab capabilities for accessing
wakelocks.
The tftp_server daemon will downgrade to user AID_SYSTEM
after enabling and retaining the necessary capabilities.

Change-Id: Iae5995f606e54152fdbe5e229c0c8d4c03b00382

rootdir/etc/init.qcom.rc

@@ -402,6 +402,10 @@ service rfs_access /system/bin/rfs_access
    user root
    group system net_raw
 
+service tftp_server /system/bin/tftp_server
+   class core
+   user root
+
 on property:wc_transport.start_hci=true
     start start_hci_filter