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This replaces the placeholder serial port icons with the
"developer_board" icon from the Material Design icon set.

Bug: 917204
Change-Id: Ic1b7e8f4a62aeb7b20e9e5152d1f708650500095
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1695846
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678506}