nit6xlite: define dry-contact pin on GPIO1:6 (pad GPIO_6)

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
defconfigs: Add CONFIG_NETFILTER as requested by Yocto folks

See https://lists.yoctoproject.org/pipermail/meta-freescale/2013-June/003051.html

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>