arm64: zynqmp: Remove additional gpio header from dlc21

This header shouldn't be in this file and there is already pointer to
dt-bindings/gpio/gpio.h.

Fixes: d2d14383bae4 ("arm64: zynqmp: Add support for DLC21 (Smartlynq+) board")
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/266bc91073f1149f3f60b1c9c0ba509c48470e2e.1644911870.git.michal.simek@xilinx.com
diff --git a/arch/arm/dts/zynqmp-dlc21-revA.dts b/arch/arm/dts/zynqmp-dlc21-revA.dts
index cf0aadf..0461219 100644
--- a/arch/arm/dts/zynqmp-dlc21-revA.dts
+++ b/arch/arm/dts/zynqmp-dlc21-revA.dts
@@ -12,7 +12,6 @@
 #include "zynqmp-clk-ccf.dtsi"
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/phy/phy.h>
-#include <include/dt-bindings/gpio/gpio.h>
 
 / {
 	model = "Smartlynq+ DLC21 RevA";