lshore: initial addition, Boundary Devices board

lshore: fix default environment
lshore: update to v2017.01
lshore: add missing wlmac address setup
lshore: add pin definitions for rev1.1
lshore: update to v2017.03

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

lshore: fix DEFCONFIG lshore_solo_defconfig
lshore: add lshore_dl_defconfig
lshore: add 800mhz_4x128mx16.cfg
lshore: use boundary.h
lshore: rgb_gpio_pads should not depend on CONFIG_CMD_FBPANEL
lshore: add CONFIG_SPI_FLASH_SPANSION
lshore: lshore_dl_defconfig add CONFIG_BLOCK_CACHE
lshore_solo: lshore_solo_defconfig add CONFIG_BLOCK_CACHE
lshore: use common code for eth init
lshore: eth.c now in common directory
lshore: move misc_init_r/do_kbd to common
lshore: move mmc_init/ dram_init/ overwrite_console/ common_board_init/ splash_screen_prepare/ board_cfb_skip to common
lshore: use common 800mhz_4x128mx16.cfg
lshore: add  CONFIG_SPI_FLASH_GIGADEVICE: to defconfigs
lshore: 800mhz_2x128mx16.cfg: remove _P1 accesses
lshore/800mhz_2x128mx16.cfg: use common values

CFG0: 0x40435323 to 0x3f435333
tRFC - 65 to 64 clocks
tFAW - 19 to 20 clocks

CFG1: 0xB66E8D63 to 0xb68e8b63
tRC from 20 to 21 clocks
tWR from 7 to 6 clocks

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

lshore: use common ddr scripts
lshore: read revision switches
lshore: check USB before mmc
lshore: port to v2018.07

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