imx: Unify CONFIG_BOOTDELAY

In order to provide a consistent user experience for imx board users,
remove the custom CONFIG_BOOTDELAY values from defconfig files, so that
all boards can use the default two second delay.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
30 files changed