imx8m: add i.MX8MN ddr4 image cfg file

Add cfg file for i.MX8MN DDR4

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx8m/imximage-8mn-ddr4.cfg b/arch/arm/mach-imx/imx8m/imximage-8mn-ddr4.cfg
new file mode 100644
index 0000000..1405c65
--- /dev/null
+++ b/arch/arm/mach-imx/imx8m/imximage-8mn-ddr4.cfg
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019 NXP
+ */
+
+#define __ASSEMBLY__
+
+FIT
+ROM_VERSION	v2
+BOOT_FROM	sd
+LOADER		spl/u-boot-spl-ddr.bin	0x912000
+SECOND_LOADER	u-boot.itb		0x40200000 0x60000
+
+DDR_FW ddr4_imem_1d.bin
+DDR_FW ddr4_dmem_1d.bin
+DDR_FW ddr4_imem_2d.bin
+DDR_FW ddr4_dmem_2d.bin