mx6_r: initial addition, Boundary Devices board

mx6_r.h: CONFIG_IPUV3_CLK 264000000
mx6_r: add CONFIG_CMD_GPIO
mx6_r: explicit fbp_detect_i2c
mx6_r: use VDF_LB043
mx6_r: verify port in board_ehci_hcd_init
mx6_r: use boundary.h
mx6_r: setup rgb_gpio_pads in board_early_init_f
mx6_r: add CONFIG_SPI_FLASH_SPANSION
mx6_r: mx6_r_defconfig add CONFIG_BLOCK_CACHE
mx6_r: use common code for eth init
mx6_r: eth.c now in common directory
mx6_r: move misc_init_r/do_kbd to common
mx6_r: move mmc_init/ dram_init/ overwrite_console/ common_board_init/ splash_screen_prepare/ board_cfb_skip to common
mx6_r: add  CONFIG_SPI_FLASH_GIGADEVICE: to defconfigs
mx6_r: add mx6_r_q2g.cfg
mx6_r: port to v2018.07

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

mx6_r: update to v2017.01
mx6_r: update to v2017.03

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