smartmontools: change EAPI version from 6 to 5.

fizz factory branch doesn't support EAPI 6 yet so need to downgrade it
to 5.

BUG=None
TEST=pass the trybot build.

Change-Id: Id5f7c78e251149dcc3c07a970901c7f88be0952c
Reviewed-on: https://chromium-review.googlesource.com/1103425
Reviewed-by: Marco Chen <marcochen@chromium.org>
Commit-Queue: Marco Chen <marcochen@chromium.org>
Tested-by: Marco Chen <marcochen@chromium.org>
2 files changed