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The Fuchsia build reshuffled to unify architecture naming between
internal components, so this updates local-sdk.py to reflect those
changes.

Change-Id: I7534d0a339b99cc0baeeeb5734e3edb63fe97d96
Reviewed-on: https://chromium-review.googlesource.com/951637Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541268}