nitrogen8mm: add nitrogen8mm_2gr0_defconfig

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

configs/nitrogen8mm_2gr0_defconfig

+CONFIG_ARM=y
+CONFIG_ARCH_IMX8M=y
+CONFIG_SYS_TEXT_BASE=0x40200000
+CONFIG_SPL_GPIO_SUPPORT=y
+CONFIG_SPL_LIBCOMMON_SUPPORT=y
+CONFIG_SPL_LIBGENERIC_SUPPORT=y
+CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_TARGET_NITROGEN8MM=y
+CONFIG_DDR_RANK_BITS=0
+CONFIG_SPL_MMC_SUPPORT=y
+CONFIG_SPL_SERIAL_SUPPORT=y
+CONFIG_SPL_DRIVERS_MISC_SUPPORT=y
+CONFIG_SPL=y
+CONFIG_DEBUG_UART_BASE=0x30860000
+CONFIG_DEBUG_UART_CLOCK=25000000
+CONFIG_DEFAULT_DEVICE_TREE="imx8mm-nitrogen8mm"
+CONFIG_DEBUG_UART=y
+CONFIG_DISTRO_DEFAULTS=y
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_FIT=y
+CONFIG_SPL_LOAD_FIT=y
+CONFIG_SPL_FIT_GENERATOR="arch/arm/mach-imx/mkimage_fit_atf.sh"
+CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/imx8m/imximage.cfg,SPL_TEXT_BASE=0x7E1000,DDR_MB=2048,DEFCONFIG=\"nitrogen8mm_2gr0\""
+CONFIG_BOOTSTAGE_STASH_SIZE=4096
+CONFIG_ARCH_MISC_INIT=y
+CONFIG_SPL_BOARD_INIT=y
+CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_USB_HOST_SUPPORT=y
+CONFIG_SPL_USB_GADGET_SUPPORT=y
+CONFIG_SPL_USB_SDP_SUPPORT=y
+CONFIG_SPL_WATCHDOG_SUPPORT=y
+CONFIG_CMD_IMLS=y
+CONFIG_CMD_MEMTEST=y
+CONFIG_SYS_ALT_MEMTEST=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPT=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_TIME=y
+CONFIG_CMD_REGULATOR=y
+CONFIG_CMD_EXT4_WRITE=y
+# CONFIG_SPL_DOS_PARTITION is not set
+# CONFIG_ISO_PARTITION is not set
+# CONFIG_SPL_EFI_PARTITION is not set
+CONFIG_PARTITION_TYPE_GUID=y
+CONFIG_OF_CONTROL=y
+CONFIG_ENV_IS_IN_MMC=y
+CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_SYS_FSL_SEC_LE=y
+CONFIG_IMX8M_LPDDR4=y
+CONFIG_USB_FUNCTION_FASTBOOT=y
+CONFIG_FASTBOOT_BUF_ADDR=0x42800000
+CONFIG_FASTBOOT_BUF_SIZE=0x40000000
+CONFIG_FASTBOOT_FLASH=y
+CONFIG_FASTBOOT_FLASH_MMC_DEV=0
+CONFIG_DM_GPIO=y
+CONFIG_DM_I2C=y
+CONFIG_SYS_I2C_MXC=y
+CONFIG_SYS_I2C_MXC_I2C1=y
+CONFIG_SYS_I2C_MXC_I2C2=y
+CONFIG_SYS_I2C_MXC_I2C3=y
+CONFIG_SYS_I2C_MXC_I2C4=y
+CONFIG_DM_MMC=y
+CONFIG_MMC_IO_VOLTAGE=y
+CONFIG_MMC_UHS_SUPPORT=y
+CONFIG_FSL_ESDHC=y
+CONFIG_PHYLIB=y
+CONFIG_PHY_ATHEROS=y
+CONFIG_NETDEVICES=y
+CONFIG_FEC_MXC=y
+CONFIG_FEC_PHY_BITBANG=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX8M=y
+CONFIG_DM_REGULATOR=y
+CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_DM_REGULATOR_GPIO=y
+CONFIG_DEBUG_UART_MXC=y
+CONFIG_MXC_UART=y
+CONFIG_DM_THERMAL=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_MXC_USB_OTG_HACTIVE=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_KEYBOARD=y
+CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_MANUFACTURER="Boundary"
+CONFIG_USB_GADGET_VENDOR_NUM=0x3016
+CONFIG_USB_GADGET_PRODUCT_NUM=0x0001
+CONFIG_USB_GADGET_SPL_SPD_PRODUCT_NUM=0x1000
+CONFIG_CI_UDC=y
+CONFIG_USB_ETHER=y
+CONFIG_USB_ETH_CDC=y
+CONFIG_USBNET_DEVADDR="00:19:b8:00:00:02"
+CONFIG_USBNET_HOST_ADDR="00:19:b8:00:00:01"
+CONFIG_USB_HOST_ETHER=y