dm: imx: cm_fx6: Add device tree for cm_fx6

Add this file so we can use device-tree control for cm_fx6. It comes from
linux 4.12.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 2cbdb17..a8b61e9 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -357,6 +357,7 @@
 	imx6sll-evk.dtb \
 	imx6dl-icore.dtb \
 	imx6dl-icore-rqs.dtb \
+	imx6q-cm-fx6.dtb \
 	imx6q-icore.dtb \
 	imx6q-icore-rqs.dtb \
 	imx6q-logicpd.dtb \