arm64: mvebu: Add basic support for uDPU board

This adds initial support for micro-DPU (uDPU) board which is based on Armada-3720 SoC.
micro-DPU is the single-port FTTdp "distribution point unit" made by Methode Electronics
which offers complete modularity with replaceable SFP modules both for uplink and downlink
(G.hn over twisted-pair, G.hn over coax, 1G and 2.5G Ethernet over Cat-5e cable).

On-board features:
- 512 MiB DDR3
- 2 x 2.5G SFP via HSGMII SERDES interface to the A3720 SoC
- USB 2.0 Type-C connector
- 4GB eMMC
- ETSI TS 101548 reverse powering via twisted pair (RJ45) or coax (F Type)

Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Luis Torres <luis.torres@methode.com>
Cc: Scott Roberts <scott.roberts@telus.com>
Cc: Paul Arola <paul.arola@telus.com>
Signed-off-by: Vladimir Vid <vladimir.vid@sartura.hr>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/configs/uDPU_defconfig b/configs/uDPU_defconfig
new file mode 100644
index 0000000..53f2b6e
--- /dev/null
+++ b/configs/uDPU_defconfig
@@ -0,0 +1,94 @@
+CONFIG_ARM=y
+CONFIG_ARCH_MVEBU=y
+CONFIG_SYS_TEXT_BASE=0x00000000
+CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_TARGET_MVEBU_ARMADA_37XX=y
+CONFIG_DEBUG_UART_BASE=0xd0012000
+CONFIG_DEBUG_UART_CLOCK=25804800
+CONFIG_SMBIOS_PRODUCT_NAME="uDPU"
+CONFIG_DEBUG_UART=y
+CONFIG_AHCI=y
+CONFIG_DISTRO_DEFAULTS=y
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_FIT=y
+CONFIG_SPI_BOOT=y
+CONFIG_SYS_CONSOLE_INFO_QUIET=y
+# CONFIG_DISPLAY_CPUINFO is not set
+# CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_ARCH_EARLY_INIT_R=y
+CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_SYS_PROMPT="uDPU>> "
+# CONFIG_CMD_ELF is not set
+# CONFIG_CMD_IMI is not set
+# CONFIG_CMD_XIMG is not set
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_PCI=y
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_USB=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_TFTPPUT=y
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_TIME=y
+CONFIG_CMD_MVEBU_BUBT=y
+CONFIG_CMD_EXT4_WRITE=y
+CONFIG_CMD_MTDPARTS=y
+CONFIG_MTDIDS_DEFAULT="nor0=spi0"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=spi0:4m(uboot),-(rootfs)"
+CONFIG_MAC_PARTITION=y
+CONFIG_DEFAULT_DEVICE_TREE="armada-3720-uDPU"
+CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_NET_RANDOM_ETHADDR=y
+CONFIG_AHCI_MVEBU=y
+CONFIG_CLK=y
+CONFIG_CLK_MVEBU=y
+CONFIG_DM_GPIO=y
+CONFIG_DM_I2C=y
+CONFIG_DM_I2C_GPIO=y
+CONFIG_MISC=y
+CONFIG_DM_MMC=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_SDMA=y
+CONFIG_MMC_SDHCI_XENON=y
+CONFIG_MTD=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_BAR=y
+CONFIG_SPI_FLASH_MACRONIX=y
+CONFIG_SPI_FLASH_SPANSION=y
+CONFIG_SPI_FLASH_STMICRO=y
+# CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
+CONFIG_SPI_FLASH_MTD=y
+CONFIG_PHYLIB_10G=y
+CONFIG_PHY_MARVELL=y
+CONFIG_PHY_GIGE=y
+CONFIG_E1000=y
+CONFIG_MVNETA=y
+CONFIG_PCI=y
+CONFIG_DM_PCI=y
+CONFIG_PCI_AARDVARK=y
+CONFIG_MVEBU_COMPHY_SUPPORT=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_ARMADA_37XX=y
+CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_DM_REGULATOR_GPIO=y
+# CONFIG_SPL_SERIAL_PRESENT is not set
+CONFIG_DEBUG_MVEBU_A3700_UART=y
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_DEBUG_UART_ANNOUNCE=y
+CONFIG_MVEBU_A3700_UART=y
+CONFIG_MVEBU_A3700_SPI=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_HOST_ETHER=y
+CONFIG_USB_ETHER_ASIX=y
+CONFIG_USB_ETHER_MCS7830=y
+CONFIG_USB_ETHER_RTL8152=y
+CONFIG_USB_ETHER_SMSC95XX=y
+CONFIG_LZO=y
+CONFIG_SPL_LZO=y