Add basic SECO MX6Q/uQ7 board support (Ethernet, UART, SD are supported). It also adds a Kconfig skeleton to later add more SECO board (supporting SoC and board variants).
Signed-off-by: Boris Brezillon
CONFIG_SYS_EXTRA_OPTIONS="ENV_IS_IN_MMC" CONFIG_ARM=y CONFIG_ARCH_MX6=y CONFIG_TARGET_SECOMX6=y CONFIG_SECOMX6_UQ7=y CONFIG_SECOMX6Q=y CONFIG_SECOMX6_2GB=y
