eo: initial addition, Boundary Devices board

eo: add eo_duallite_defconfig
eo.h: CONFIG_IPUV3_CLK 264000000
eo: use nitrogen6x/ddr-setup.cfg
eo: use MX6Q or MX6DL instead of MX6QDL
eo: add CONFIG_CMD_GPIO
eo: explicit fbp_detect_i2c
eo: add wlmac
eo: use boundary.h
eo: add CONFIG_SPI_FLASH_SPANSION
eo: eo_defconfig add CONFIG_BLOCK_CACHE
eo_duallite: eo_duallite_defconfig add CONFIG_BLOCK_CACHE
eo: use common code for eth init
eo: eth.c now in common directory
eo: move misc_init_r/do_kbd to common
eo: move mmc_init/ dram_init/ overwrite_console/ common_board_init/ splash_screen_prepare/ board_cfb_skip to common
eo: use common 1066mhz_4x128mx16.cfg
eo: add  CONFIG_SPI_FLASH_GIGADEVICE: to defconfigs
eo: use common ddr scripts
eo: port to v2018.07

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

eo: update to v2017.01
eo: update to v2017.03

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>