libchromeos: Move data_encoding from Buffet to libchromeos

BUG=chromium:405714
TEST=USE=buffet ./build_packages

Change-Id: I9c9d3994d1e33a05cd5c978a2697164071ce5aa0
Reviewed-on: https://chromium-review.googlesource.com/213362
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Bertrand Simonnet <bsimonnet@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
11 files changed
tree: 8214e8f2c8bd739fd5f890d1f78677016b9e20d1
  1. buffet/