This is already done for VM_FSTYPE in a much better way.

mipsel-bfk3 feature often serves as basis for special
build for various other BE-T1000-based devices. Having
DTB name in config.mk simplifies creating such derivatives.

This is necessary for the 'rootfs' initrd feature to work properly

This bug was introduced in c310a1e9 and was
breaking bfk3 builds ever since.

We only plan to distribute XZ-compressed rootfs tarballs.

(mike@: merging cleaned-up version)