I would like to add a new layer for a custom board based on the ls1021atwr. Up till now, I have made the changes directly to the meta-fsl-arm layer. In particular, I need change the ls1021atwr.conf machine configuration file to use a different u-boot and kernel. Will I be able to use the same 'ls1021atwr.conf', with changes, inside a new higher-priority yocto layer? Or will I instead need to create a new BSP layer in order to support a new machine configuration?