pd: do not respond to unknown SVDMs
pd: do not respond to unknown SVDMs

bug fix: if we see an unknown SVDM, do not respond to it.

BUG=none
BRANCH=samus
TEST=test with third party that sends unknown SVDM

Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/224179
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
(cherry picked from commit 647ac36fda37a8ec6dd0371ab0f1e4d9780bead8)
Signed-off-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>

Change-Id: I3ef6c38be029d57bf3784ba832b7ae137f379049
Reviewed-on: https://chromium-review.googlesource.com/225723
Tested-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Reviewed-by: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>
Commit-Queue: Duncan Laurie <70662b43bc1a20b57ded72a2b08be88dd0da4841@chromium.org>

thehobn/ec,thehobn/ec,thehobn/ec,thehobn/ec