arm64: zynqmp: Rename clocks as per the Arasan NAND driver

In zynqmp.dtsi file renamed "clk_sys" clock to "controller" and
"clk_flash" clock to "bus" as per upstreamed Arasan NAND driver.
This fixes NAND driver probe failure.
Signed-off-by: NAmit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm/dts/zynqmp.dtsi

@@ -505,7 +505,7 @@
 			compatible = "arasan,nfc-v3p10";
 			status = "disabled";
 			reg = <0x0 0xff100000 0x0 0x1000>;
-			clock-names = "clk_sys", "clk_flash";
+			clock-names = "controller", "bus";
 			interrupt-parent = <&gic>;
 			interrupts = <0 14 4>;
 			#address-cells = <1>;