Remove LTS as channel from prototype.

Remove LTS as a channel type from the prototype as the implementation
for LTS is not being done as a channel.

BUG=None
TEST=./generate.sh

Change-Id: If3c5b62dfc0c4584ff962465f3503ed8bbd1a5c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2391111
Reviewed-by: Christine Lee <leecy@chromium.org>
Reviewed-by: C Shapiro <shapiroc@chromium.org>
Commit-Queue: C Shapiro <shapiroc@chromium.org>
Tested-by: C Shapiro <shapiroc@chromium.org>
2 files changed