Move CONFIG_CMD_SATA option to Kconfig to fix the following build
error:
In file included from include/configs/mx6cuboxi.h:137:0,
from include/config.h:7,
from include/common.h:21,
from common/env_common.c:11:
include/config_distro_bootcmd.h:161:2: error: expected '}' before 'BOOT_TARGET_DEVICES_references_SATA_without_CONFIG_SATA'
BOOT_TARGET_DEVICES_references_SATA_without_CONFIG_SATA