python: reformat using black Ran cros format across the files, and manually adjusted docstrings and long lines. BUG=None TEST=CQ passes Change-Id: Ie6c4809cde62196505b018b297563dcbbe7b7e36 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashmap/+/4600613 Tested-by: Mike Frysinger <[email protected]> Reviewed-by: Jack Rosenthal <[email protected]> Commit-Queue: Mike Frysinger <[email protected]>