The uname was reported incorrectly, and should have read "ppc64le".
Update the script to reference this.

TBR=iannucci@chromium.org
BUG=chromium:773857
TEST=None

Change-Id: Ice5ffe1257333b2bc1bfef7da60dcea4ead4d4c8
Reviewed-on: https://chromium-review.googlesource.com/723162Reviewed-by: Daniel Jacques <dnj@chromium.org>
Commit-Queue: Daniel Jacques <dnj@chromium.org>