arm: imx: add i.MX8ULP basic Kconfig option

Add i.MX8ULP related basic Kconfig option, which will be used later.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>

arch/arm/Kconfig

@@ -801,6 +801,15 @@ config ARCH_IMX8M
 	select SUPPORT_SPL
 	imply CMD_DM
 
+config ARCH_IMX8ULP
+	bool "NXP i.MX8ULP platform"
+	select ARM64
+	select DM
+	select OF_CONTROL
+	select SUPPORT_SPL
+	select GPIO_EXTRA_HEADER
+	imply CMD_DM
+
 config ARCH_IMXRT
 	bool "NXP i.MXRT platform"
 	select CPU_V7M
@@ -1971,6 +1980,8 @@ source "arch/arm/mach-imx/imx8/Kconfig"
 
 source "arch/arm/mach-imx/imx8m/Kconfig"
 
+source "arch/arm/mach-imx/imx8ulp/Kconfig"
+
 source "arch/arm/mach-imx/imxrt/Kconfig"
 
 source "arch/arm/mach-imx/mxs/Kconfig"

arch/arm/mach-imx/imx8ulp/Kconfig

+if ARCH_IMX8ULP
+
+config IMX8ULP
+	bool
+	select ARMV8_SPL_EXCEPTION_VECTORS
+
+config SYS_SOC
+	default "imx8ulp"
+
+choice
+	prompt "i.MX8ULP board select"
+	optional
+
+endchoice
+
+endif