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In order to ensure homogeneous fleets, we need to have more specific
dimension values when looking for bots. This set of CLs updated some
existing dimensions, and added the synthetic_product_name values for
dimensions if appropriate.

This CL updated the dimensions for linux-perf:
 - Added synthetic product name 'PowerEdge R230 (Dell Inc.)';
 - Updated GPU from '10de:1cb3' to '10de:1cb3-384.90';
 - Updated OS from 'Ubuntu' to 'Ubuntu-14.04'

Please check the link below for the available bots based on the
old/new dimensions:
https://chrome-swarming.appspot.com/botlist?c=id&c=task&c=gpu&c=os&c=status&c=synthetic_product_name&d=asc&f=gpu%3A10de%3A1cb3&f=os%3AUbuntu&f=cpu%3Ax86-64&f=pool%3Achrome.tests.perf&s=id

Bug: chromium:996830
Change-Id: I0eaaea53448d3044b6f10f9020c8f4c1a27318eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888193Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Cr-Commit-Position: refs/heads/master@{#710569}