ARM: imx: use #include for all device trees

Replace /include/ (dtc) with #include (C pre-processor) for all imx DT
files, so that gcc -E handles the entire include tree, and hence any of
those files can #include some other file e.g. for constant definitions.

This allows future use of #defines and header files in order to define
names for various constants, such as pinctrl settings. Use of those
features will increase the readability of the device tree files.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/boot/dts/imx27-apf27.dts b/arch/arm/boot/dts/imx27-apf27.dts
index b464c80..ba4c6df 100644
--- a/arch/arm/boot/dts/imx27-apf27.dts
+++ b/arch/arm/boot/dts/imx27-apf27.dts
@@ -13,7 +13,7 @@
  */
 
 /dts-v1/;
-/include/ "imx27.dtsi"
+#include "imx27.dtsi"
 
 / {
 	model = "Armadeus Systems APF27 module";