add default xorg.conf; update .gitmodules

.gitmodules

@@ -16,5 +16,10 @@
 [submodule "xserver"]
 	path = xserver
 	url = git://anongit.freedesktop.org/xorg/xserver
-
+[submodule "xkbcomp"]
+	path = xkbcomp
+	url = https://gitlab.freedesktop.org/xorg/app/xkbcomp
+[submodule "xkeyboard-config"]
+	path = xkeyboard-config
+	url = git://anongit.freedesktop.org/git/xkeyboard-config
 

xorg.conf

@@ -0,0 +1,19 @@
+Section "Device"
+  Identifier "etnaviv"
+  Driver "modesetting"
+  Option "kmsdev" "/dev/dri/card1"
+  Option "AccelMethod" "glamor"
+  Option "SWcursor" "off"
+  Option "ShadowFB" "off"
+  Option "PageFlip" "off"
+EndSection
+
+Section "ServerFlags"
+  Option "AutoAddGPU" "false"
+EndSection
+
+Section "Files"
+  ModulePath "/usr/local/lib/xorg/modules"
+  ModulePath "/usr/local/lib/arm-linux-gnueabihf/xorg/modules"
+EndSection
+