Exclude toolchain packages from eclean.

BUG=b:187987427, chromium:1202194
TEST=./build_packages --board=${BOARD} && ./build_image --board=${BOARD}

Change-Id: Id28b7c0ab7c7327918c68b1fc5ec8e5df0b73bf9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2891526
Commit-Queue: Allen Webb <allenwebb@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Allen Webb <allenwebb@google.com>
Auto-Submit: Allen Webb <allenwebb@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
4 files changed