imx8mn_ddr4_evk: Add USB Mass Storage support

Add USB Mass Storage support, which is a convenient way to flash
the eMMC card, for example.

Signed-off-by: Fabio Estevam <festevam@denx.de>
diff --git a/configs/imx8mn_ddr4_evk_defconfig b/configs/imx8mn_ddr4_evk_defconfig
index 56a30744..bc1cfa4 100644
--- a/configs/imx8mn_ddr4_evk_defconfig
+++ b/configs/imx8mn_ddr4_evk_defconfig
@@ -41,6 +41,8 @@
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_USB_MASS_STORAGE=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_REGULATOR=y
 CONFIG_CMD_EXT4_WRITE=y
@@ -82,4 +84,14 @@
 CONFIG_SYSRESET_PSCI=y
 CONFIG_SYSRESET_WATCHDOG=y
 CONFIG_DM_THERMAL=y
+CONFIG_USB=y
+# CONFIG_SPL_DM_USB is not set
+CONFIG_USB_EHCI_HCD=y
+CONFIG_MXC_USB_OTG_HACTIVE=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_MANUFACTURER="FSL"
+CONFIG_USB_GADGET_VENDOR_NUM=0x0525
+CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
+CONFIG_CI_UDC=y
+CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_IMX_WATCHDOG=y