[all][init] Start droid-hal-init.service after loading systemd-tmpfiles-setup.service

droid-hal-startup.sh passes socket information to droid-init-done.sh through /run/droid-hal/notify-socket-name file.
/run/droid-hal directory is setup by systemd-tmpfiles-setup.service. Running droid-hal-init.service before systemd-tmpfiles-setup.service will cause an error, so droid-hal-init.service should be started after systemd-tmpfiles-setup.service
Merge pull request #74 from siteshwar/dhd-74

[all][init] Start droid-hal-init.service after loading systemd-tmpfiles-...