xserver-xf86-config: Sync i.MX xorg.conf files with meta-fsl-bsp-release layer

- Remove upstreamed config files
- Add a base version
- Add i.MX 6ULL config file

https://jira.digi.com/browse/DEL-6443

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>

meta-digi-dey/recipes-graphics/xorg-xserver/xserver-xf86-config/mx6ull/xorg.conf

@@ -0,0 +1,12 @@
+Section "Device"
+    Identifier  "Kernel Framebuffer Device"
+    Driver      "fbdev"
+    Option      "fbdev" "/dev/fb0"
+EndSection
+
+Section "ServerFlags"
+    Option "BlankTime"  "0"
+    Option "StandbyTime"  "0"
+    Option "SuspendTime"  "0"
+    Option "OffTime"  "0"
+EndSection

meta-digi-dey/recipes-graphics/xorg-xserver/xserver-xf86-config/mx7ulp/xorg.conf

@@ -1,15 +0,0 @@
-Section "Device"
-    Identifier  "i.MX Accelerated Framebuffer Device"
-    Driver      "vivante"
-    Option      "fbdev"     "/dev/fb0"
-    Option      "vivante_fbdev" "/dev/fb0"
-    Option      "HWcursor"  "false"
-    Option      "VivCacheMem"  "false"
-EndSection
-
-Section "ServerFlags"
-    Option "BlankTime"  "0"
-    Option "StandbyTime"  "0"
-    Option "SuspendTime"  "0"
-    Option "OffTime"  "0"
-EndSection