mx6cuboxi: Move CONFIG_CMD_SATA to Kconfig

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

Reported-by: Stefano Babic <sbabic@denx.de>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
diff --git a/configs/mx6cuboxi_defconfig b/configs/mx6cuboxi_defconfig
index c35ea92..dd974b2 100644
--- a/configs/mx6cuboxi_defconfig
+++ b/configs/mx6cuboxi_defconfig
@@ -23,6 +23,7 @@
 CONFIG_CMD_MMC=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_GPIO=y
+CONFIG_CMD_SATA=y
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT4_WRITE=y
 # CONFIG_SPL_PARTITION_UUIDS is not set