CHROMIUM: config: enable dmc needed config

BUG=chrome-os-partner:54651
TEST=Boot from kevin

Change-Id: I31e9abc4e17f53a5926cbd450b8a8d28f2eee480
Signed-off-by: Lin Huang <hl@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/364450
Commit-Ready: Derek Basehore <dbasehore@chromium.org>
Tested-by: Derek Basehore <dbasehore@chromium.org>
Reviewed-by: Jianqun Xu <jay.xu@rock-chips.com>
Reviewed-by: Derek Basehore <dbasehore@chromium.org>
(cherry picked from commit 3b81685ce2855d4d8aabac79ab85be50b3aa6fb2)
Reviewed-on: https://chromium-review.googlesource.com/422938