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Updating with CL:2494163, this commit replaces GetAttribute with
GetAttributes so that sensor clients can get multiple attributes within
one Mojo request.

BUG=chromium:1006141, b:162154663
TEST=builds and run ash on octopus

Change-Id: I33fb315050b5aaefa8e387a8afcdc2aa1c9ca2da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490320Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Cheng-Hao Yang <chenghaoyang@chromium.org>
Auto-Submit: Cheng-Hao Yang <chenghaoyang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820263}