neptune: hide mouse cursor

Since the main neptune screen is rotated, using mouse there
is confusing.

Change-Id: I04bb5ae04ea3a637a5fcc8255719e23002024ce2
Fixes: AUTOSUITE-1291
Fixes: AUTOSUITE-1458
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>
(cherry picked from commit thud/f52d40ba)

meta-boot2qt/recipes-qt/automotive/neptune3-ui/neptune.service

@@ -8,6 +8,7 @@ ExecStart=/usr/bin/appcontroller /opt/neptune3/neptune3-ui -r --dbus session -c
 Restart=on-failure
 WorkingDirectory=/opt/neptune3
 Environment=AM_STARTUP_TIMER=1
+Environment=QT_QPA_EGLFS_HIDECURSOR=1
 
 [Install]
 WantedBy=multi-user.target