clean up licenses/urls after merge

We have a common LICENSE file for this repo, so use that.

Update the URLs to use the new git paths.

BUG=None
TEST=build_packages passes for many boards
CQ-DEPEND=CL:205370

Change-Id: Ia60071ad2bec9a90b913a4057a617c6916533df6
Reviewed-on: https://chromium-review.googlesource.com/204953


Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>