bundle_firmware: allow removal of files in RW regions through cbfs-files

In addition to allowing
    cbfs-files { foo = "add -n foo"; };
also support
    cbfs-files { bar = "remove -n bar"; };

TEST=add a cbfs-files { } remove statement as outlined above (eg. for
"revision"), build depthcharge and chromeos-bootimage and observe that
the file was removed as requested.

Change-Id: Ie7932388d57c7bfb541aa0c1b812ea600ac6ea9e
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/321630
Commit-Ready: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed