arm64: zynqmp: Use C pre-processor for includes

Change the dtsi include code to use the C pre-processor #include instead
of the device tree /include/. This enables option to use dt binding
headers.

Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
Reviewed-by: Sören Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-ep108.dts b/arch/arm64/boot/dts/xilinx/zynqmp-ep108.dts
index ee7fa27..fba8f04 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-ep108.dts
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-ep108.dts
@@ -13,8 +13,8 @@
 
 /dts-v1/;
 
-/include/ "zynqmp.dtsi"
-/include/ "zynqmp-ep108-clk.dtsi"
+#include "zynqmp.dtsi"
+#include "zynqmp-ep108-clk.dtsi"
 
 / {
 	model = "ZynqMP EP108";