imx6: fix warnings due to switch to distro environment

wandboard and mx6cuboxi have warnings because BOOT_DELAY
is defined twice.

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Vagrant Cascadian <vagrant@debian.org>
CC: Otavio Salvador <otavio@ossystems.com.br>
CC: Fabio Estevam <fabio.estevam@freescale.com>
2 files changed