checkpatch.pl: update to latest from v4.4

Copied scripts/{checkpatch.pl,spelling.txt} from the v4.4 repository.
Matches Linus' official v4.4 tag too.

BUG=none
TEST=try to upload some good and bad patches with `repo upload`

Change-Id: I59ab4d3bf3d9db07a6dfea28e71777d5315029d7
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/352572
Reviewed-by: Mike Frysinger <vapier@chromium.org>
2 files changed