spring: update board revision info for pre-PVT/PVT/MP

Including pre-PVT1 / PVT / MP in board revision IDs.

BRANCH=spring
BUG=chrome-os-partner:21666
TEST=on Spring EVT, run "mosys platform version" and
"mosys memory spd print id"

Change-Id: I217f7ef90fe1212bac499413e6928796d00c82c0
Reviewed-on: https://gerrit.chromium.org/gerrit/64676
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
4 files changed