platform2: fix sorting order of cros_disks/debugd No functional changes here. BUG=chromium:337753 TEST=`emerge-x86-alex platform2` still works Change-Id: I96a3da8f1cf83ef5e8b5cd99b7d6b0275fe084c3 Reviewed-on: https://chromium-review.googlesource.com/183643 Reviewed-by: Liam McLoughlin <lmcloughlin@chromium.org> Tested-by: Mike Frysinger <vapier@chromium.org>