[FS#57] brcm47xx-legacy target not always catching changes to files overlay

[LEDE Bugs]

The following task has a new comment added:

FS#57 - brcm47xx-legacy target not always catching changes to files overlay
User who did this - Russell Senior (russell)

----------
Just tested r1144, and starting with a "dirclean world" build, and two rebuilds with tweaked files overlay files, they both booted showing my files changes, so it appears to be fixed.  Thanks!
----------

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=57#comment153