hl: initial addition, Boundary Devices board

hl: set wlmac for TiWi
hl: use common code for eth init
hl: eth.c now in common directory
hl: move misc_init_r/do_kbd to common
hl: move mmc_init/ dram_init/ overwrite_console/ common_board_init/ splash_screen_prepare/ board_cfb_skip to common
hl: default to tm070jdhg30 instead of hannstar7
hl: add  CONFIG_SPI_FLASH_GIGADEVICE: to defconfigs
hl: 800mhz_2x256mx16.cfg: remove _P1 accesses
hl: 800mhz_2x256mx16.cfg: use common values

MDCFG2: from 0x01FF0093 to 0x01FF00db
tRTP - from 3 to 4 clocks (4 is minimum allowed)
tWTR - from 3 to 4 clocks (4 is minimum allowed)

MR0: from 0x13208030 to 0x15208030
tWR - from 5 to 6 clocks

hl: use common ddr script
hl: port to v2018.07

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