Remove "mosys platform id"

This was made for cros_config to use, but cros_config implements its
own probing logic.

BUG=chromium:990438
TEST=sudo FEATURES=test emerge mosys

Cq-Depend: chromium:1951783
Change-Id: I00b4d48507028480880078152f78a88ddf6062e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mosys/+/1915169
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Will Bradley <wbbradley@chromium.org>
2 files changed