meta-systemd: elsa: rename to entrance

* elsa was killed in r75060 and reintroduced in r75061 with old name - entrance
* also use Alias=display-manager.service like gdm does now

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-systemd/meta-efl/recipes-efl/efl/entrance/xserver-nodm.service

@@ -2,7 +2,7 @@
 Description=Login manager for Enlightenment
 
 [Service]
-ExecStart=/usr/sbin/elsa
+ExecStart=/usr/sbin/entrance
 
 [Install]
-WantedBy=multi-user.target
+Alias=display-manager.service