Drop attempts to use mtpd on Linux.

BUG=None
TEST=None

Change-Id: I5cc54fa6083e8af34925dab368a6280ab2379f4c
Reviewed-on: https://chromium-review.googlesource.com/484979
Commit-Ready: Lei Zhang <thestig@chromium.org>
Tested-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
7 files changed