Revert "cml1.bbclass: Return sorted list of cfg files"

This reverts commit dee41e92f0efac7e453597bed4b4c02f867e3aa9.

This patch breaks cases where some config files make changes to earlier ones,
ordering is important. The reproducibility issue in busybox was elsewhere.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>