ARM: socfpga: add support for IS1 board

This adds support for IS1 board. Pretty usual socfpga board,
256MB of RAM, does not have MMC, two SPI chips, one ethernet port, two
additional ethernet ports connected to the FPGA.

Signed-off-by: Pavel Machek <pavel@denx.de>

configs/socfpga_is1_defconfig

@@ -0,0 +1,43 @@
+CONFIG_ARM=y
+CONFIG_ARCH_SOCFPGA=y
+CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_SPL_DM=y
+CONFIG_DM_GPIO=y
+CONFIG_TARGET_SOCFPGA_IS1=y
+CONFIG_SPL_STACK_R_ADDR=0x00800000
+CONFIG_DEFAULT_DEVICE_TREE="socfpga_cyclone5_is1"
+CONFIG_SPL=y
+CONFIG_SPL_STACK_R=y
+CONFIG_FIT=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_MEMTEST is not set
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_MMC is not set
+CONFIG_CMD_SF=y
+CONFIG_CMD_SPI=y
+CONFIG_CMD_I2C=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_SEQ_ALIAS=y
+CONFIG_DWAPB_GPIO=y
+CONFIG_SYS_I2C_DW=y
+CONFIG_SPI_FLASH=y
+CONFIG_SPI_FLASH_BAR=y
+CONFIG_SPI_FLASH_STMICRO=y
+CONFIG_SPI_FLASH_USE_4K_SECTORS=y
+CONFIG_DM_ETH=y
+CONFIG_ETH_DESIGNWARE=y
+CONFIG_SYS_NS16550=y
+CONFIG_CADENCE_QSPI=y