gdm: do not rely on dev-tty7.device

Error message was:

[ TIME ] Timed out waiting for device dev-tty7.device.
[DEPEND] Dependency failed for Gnome Display Manager.

run tested on overo/xfce

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Signed-off-by: Eric Bénard <eric@eukrea.com>

meta-gnome/recipes-gnome/gdm/gdm/gdm.service

@@ -1,7 +1,6 @@
 [Unit]
 Description=Gnome Display Manager
-Requires=dev-tty7.device
-After=dev-tty7.device systemd-user-sessions.service
+After=systemd-user-sessions.service
 
 [Service]
 ExecStart=/usr/sbin/gdm -nodaemon

meta-gnome/recipes-gnome/gdm/gdm_2.32.2.bb

@@ -4,7 +4,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f"
 
 DEPENDS = "xinput gnome-panel tcp-wrappers libcanberra libxklavier grep consolekit libpam gnome-doc-utils gtk+ xrdb"
 
-PR = "r7"
+PR = "r8"
 
 inherit gnome update-rc.d systemd