arm: dts: lpc32xx: change include syntax to be C preprocessor friendly

The change replaces /include/ to #include in lpc32xx.dtsi and
derivatives, it is required, if C preprocessor is intended to be used
over dtsi/dts files, otherwise errors like one below are generated:

  Error: ea3250.dts:15.1-9 syntax error
  FATAL ERROR: Unable to parse input tree

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
diff --git a/arch/arm/boot/dts/lpc32xx.dtsi b/arch/arm/boot/dts/lpc32xx.dtsi
index 3abebb7..f35e982 100644
--- a/arch/arm/boot/dts/lpc32xx.dtsi
+++ b/arch/arm/boot/dts/lpc32xx.dtsi
@@ -11,7 +11,7 @@
  * http://www.gnu.org/copyleft/gpl.html
  */
 
-/include/ "skeleton.dtsi"
+#include "skeleton.dtsi"
 
 / {
 	compatible = "nxp,lpc3220";