weston-init: Change path of weston.ini so it is used for mx6 based devices also
The imx override was changed to imx-nxp-bsp before to react on the nxp overide mechanism, but the imx-nxp-bsp overirde is not set for mx6 based devices. The seconorth override has higher priority and is available for all platforms.
BCS 746-001039