arm64: zynqmp: Define label for flash node

Define a label for flash node so that it can be
referenced easily as required.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/arm/dts/zynqmp-mini-qspi.dts b/arch/arm/dts/zynqmp-mini-qspi.dts
index 49e8a42..1716d51 100644
--- a/arch/arm/dts/zynqmp-mini-qspi.dts
+++ b/arch/arm/dts/zynqmp-mini-qspi.dts
@@ -63,7 +63,7 @@
 
 &qspi {
 	status = "okay";
-	flash@0 {
+	flash0: flash@0 {
 		compatible = "n25q512a11", "spi-flash";
 		#address-cells = <1>;
 		#size-cells = <1>;