imx: add basic i.MX9 support

Add i.MX9 Kconfig and basic files for the new SoC

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d4fc833..2802b9b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -908,6 +908,15 @@
 	imply CMD_DM
 	imply DM_EVENT
 
+config ARCH_IMX9
+	bool "NXP i.MX9 platform"
+	select ARM64
+	select DM
+	select MACH_IMX
+	select SUPPORT_SPL
+	imply CMD_DM
+	imply DM_EVENT
+
 config ARCH_IMXRT
 	bool "NXP i.MXRT platform"
 	select CPU_V7M
@@ -2228,6 +2237,8 @@
 
 source "arch/arm/mach-imx/imx8ulp/Kconfig"
 
+source "arch/arm/mach-imx/imx9/Kconfig"
+
 source "arch/arm/mach-imx/imxrt/Kconfig"
 
 source "arch/arm/mach-imx/mxs/Kconfig"