socfpga: add support for Terasic DE1-SoC board

Add CycloneV based Terasic DE1-SoC board. The board boots
from SD/MMC. Ethernet and USB host is supported.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Marek Vasut <marex@denx.de>

configs/socfpga_de1_soc_defconfig

@@ -0,0 +1,50 @@
+CONFIG_ARM=y
+CONFIG_ARCH_SOCFPGA=y
+CONFIG_SYS_MALLOC_F_LEN=0x2000
+# CONFIG_SPL_SPI_SUPPORT is not set
+CONFIG_TARGET_SOCFPGA_TERASIC_DE1_SOC=y
+CONFIG_SPL_STACK_R_ADDR=0x00800000
+CONFIG_SPL_YMODEM_SUPPORT=y
+CONFIG_DEFAULT_DEVICE_TREE="socfpga_cyclone5_de1_soc"
+CONFIG_FIT=y
+CONFIG_SYS_CONSOLE_IS_IN_ENV=y
+CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE=y
+CONFIG_SYS_CONSOLE_ENV_OVERWRITE=y
+CONFIG_VERSION_VARIABLE=y
+# CONFIG_DISPLAY_BOARDINFO is not set
+CONFIG_SPL=y
+CONFIG_SPL_SYS_MALLOC_SIMPLE=y
+CONFIG_SPL_STACK_R=y
+CONFIG_HUSH_PARSER=y
+CONFIG_CMD_BOOTZ=y
+# CONFIG_CMD_IMLS is not set
+CONFIG_CMD_ASKENV=y
+CONFIG_CMD_GREPENV=y
+# CONFIG_CMD_FLASH is not set
+CONFIG_CMD_MMC=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_USB=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_CACHE=y
+CONFIG_CMD_TIME=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_EXT4_WRITE=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_SPL_DM=y
+CONFIG_DM_GPIO=y
+CONFIG_DWAPB_GPIO=y
+CONFIG_SYS_I2C_DW=y
+CONFIG_DM_MMC=y
+CONFIG_DM_ETH=y
+CONFIG_ETH_DESIGNWARE=y
+CONFIG_SYS_NS16550=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_STORAGE=y
+CONFIG_USE_TINY_PRINTF=y
+# CONFIG_EFI_LOADER is not set