board: icorem6: Add Qt5 configs for 800x480 LVDS display

i.CoreM6 Starter Kit has 800x480 LVDS display, this patch adds
relevant qt5 configs with supports opensource Etnaviv graphical stack.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
[Arnout: mention the qt5 defconfig in readme.txt, otherwise the demo
 applications don't exist]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

board/engicam/icorem6/linux_qt5.fragment

@@ -0,0 +1,4 @@
+# Currently kernel mainline exhibits issues when running cpufreq as ondemand
+# governor on mx6.
+# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
+CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y

board/engicam/icorem6/readme.txt

@@ -66,4 +66,23 @@ To boot your newly created system:
 - close JM3 for sd boot.
 - power on the board.
 
+Testing graphics on i.CoreM6 Starter Kit:
+========================================
+
+Build with support for Etnaviv, Qt5 and demo applications:
+
+  make engicam_imx6qdl_icore_qt5_defconfig
+  make
+
+Running kmscube
+# kmscube -D /dev/dri/card1
+
+Running glmark2-es2-drm
+# glmark2-es2-drm
+
+Running Qt5 Cinematic Demo:
+- for i.CoreM6 Starter Kit
+# export QT_QPA_EGLFS_KMS_CONFIG=/root/imx6qdl-icore.json
+# CinematicExperience-demo
+
 Enjoy!

board/engicam/icorem6/rootfs_overlay/root/imx6qdl-icore.json

@@ -0,0 +1,11 @@
+{
+  "device": "/dev/dri/card1",
+  "hwcursor": false,
+  "pbuffers": true,
+  "outputs": [
+    {
+      "name": "LVDS-1",
+      "mode": "800x480"
+    }
+  ]
+}