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

usd_mr2: move mmc_init/ dram_init/ overwrite_console/ common_board_init/ splash_screen_prepare/ board_cfb_skip to common
usd_mr2: add usd_mr2_q1g_defconfig
usd_mr2: let CHx_16V_FAULT/CHx_48V_FAULT float
usd_mr2: INPUT_FLOAT is in padctl-mx6 now
usd_mr2: swap sgtl5000A/B
usd_mr2: use common 1066mhz_4x256mx16.cfg
usd_mr2_qxg_defconfig: add CONFIG_SPI_FLASH_GIGADEVICE
usd_mr2: use common 1066mhz_4x128mx16.cfg
usd_mr2: use common ddr scripts
usd_mr2: port to v2018.07

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