This formats were mistakenly listed as having no conversion necessary
in the vertex formats table. Fix is to mark them as CPU-converted.

This bug would only occur for 'direct' storage attributes, not those
that were dynamically streamed.

BUG=angleproject:1331

Change-Id: Ifa51b47d75e2f5bc762a718587470950cf195cb4
Reviewed-on: https://chromium-review.googlesource.com/329999
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>