board/freescale/imx6-sabresd: Fix the Qt5 display names

The correct syntax that Qt5 understands for display names is
"HDMI1" and "LVDS1", so fix it accordingly.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/freescale/imx6-sabresd/rootfs_overlay/root/sabresd.json

@@ -4,11 +4,11 @@
   "pbuffers": true,
   "outputs": [
     {
-      "name": "HDMI-1",
+      "name": "HDMI1",
       "mode": "off"
     },
     {
-      "name": "LVDS-1",
+      "name": "LVDS1",
       "mode": "1024x768"
     }
   ]