arm64: dts: imx8ulp-evk: add spi-nor device support

Add spi-nor support.
- 8 bit mode for RX/TX.
- Set the clock rate to 200MHz.
- add default/sleep pinctrl.
Co-developed-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8ulp-evk.dts

@@ -95,6 +95,21 @@ &cm33 {
 	status = "okay";
 };
 
+&flexspi2 {
+	pinctrl-names = "default", "sleep";
+	pinctrl-0 = <&pinctrl_flexspi2_ptd>;
+	pinctrl-1 = <&pinctrl_flexspi2_ptd>;
+	status = "okay";
+
+	mx25uw51345gxdi00: flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <200000000>;
+		spi-tx-bus-width = <8>;
+		spi-rx-bus-width = <8>;
+	};
+};
+
 &lpuart5 {
 	/* console */
 	pinctrl-names = "default", "sleep";
@@ -159,6 +174,23 @@ MX8ULP_PAD_PTF10__ENET0_1588_CLKIN 0x43
 		>;
 	};
 
+	pinctrl_flexspi2_ptd: flexspi2ptdgrp {
+		fsl,pins = <
+
+			MX8ULP_PAD_PTD12__FLEXSPI2_A_SS0_B	0x42
+			MX8ULP_PAD_PTD13__FLEXSPI2_A_SCLK	0x42
+			MX8ULP_PAD_PTD14__FLEXSPI2_A_DATA3	0x42
+			MX8ULP_PAD_PTD15__FLEXSPI2_A_DATA2	0x42
+			MX8ULP_PAD_PTD16__FLEXSPI2_A_DATA1	0x42
+			MX8ULP_PAD_PTD17__FLEXSPI2_A_DATA0	0x42
+			MX8ULP_PAD_PTD18__FLEXSPI2_A_DQS	0x42
+			MX8ULP_PAD_PTD19__FLEXSPI2_A_DATA7	0x42
+			MX8ULP_PAD_PTD20__FLEXSPI2_A_DATA6	0x42
+			MX8ULP_PAD_PTD21__FLEXSPI2_A_DATA5	0x42
+			MX8ULP_PAD_PTD22__FLEXSPI2_A_DATA4	0x42
+		>;
+	};
+
 	pinctrl_lpuart5: lpuart5grp {
 		fsl,pins = <
 			MX8ULP_PAD_PTF14__LPUART5_TX	0x3