arm64: dts: imx8ulp: Fix the SPI clock-names order

spi-nxp-fspi.yaml expects the clock-names entries to be in
the following order: "fspi_en", "fspi".

Change it accordingly to fix the following schema warnings:

imx8ulp-evk.dtb: spi@29810000: clock-names:0: 'fspi_en' was expected
	from schema $id: http://devicetree.org/schemas/spi/spi-nxp-fspi.yaml#
imx8ulp-evk.dtb: spi@29810000: clock-names:1: 'fspi' was expected
	from schema $id: http://devicetree.org/schemas/spi/spi-nxp-fspi.yaml#Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8ulp.dtsi

@@ -360,7 +360,7 @@ flexspi2: spi@29810000 {
 				interrupts = <GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&pcc4 IMX8ULP_CLK_FLEXSPI2>,
 					 <&pcc4 IMX8ULP_CLK_FLEXSPI2>;
-				clock-names = "fspi", "fspi_en";
+				clock-names = "fspi_en", "fspi";
 				assigned-clocks = <&pcc4 IMX8ULP_CLK_FLEXSPI2>;
 				assigned-clock-parents = <&cgc1 IMX8ULP_CLK_SPLL3_PFD3_DIV2>;
 				status = "disabled";