arm: imx: add i.MX8ULP cpu type and helper

Add i.MX8ULP cpu type and helpers.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx8ulp/soc.c b/arch/arm/mach-imx/imx8ulp/soc.c
new file mode 100644
index 0000000..b3679ae
--- /dev/null
+++ b/arch/arm/mach-imx/imx8ulp/soc.c
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2021 NXP
+ */
+
+#include <asm/arch/sys_proto.h>
+
+u32 get_cpu_rev(void)
+{
+	return (MXC_CPU_IMX8ULP << 12) | CHIP_REV_1_0;
+}