Revert "scarlet: support rearrangement of warm_reset"

Use 'remap' on the board overlays instead. Another change will follow.

CQ-DEPEND=CL:719597
BUG=b:67756253
TEST=Pending to the change follows.

This reverts commit aa2702f0352c7148619522b7764e7bac545749f4.

Change-Id: Id995a6d5fce044db52efa5c4bf846359cca56999
Reviewed-on: https://chromium-review.googlesource.com/719596
Commit-Ready: Wai-Hong Tam <waihong@google.com>
Tested-by: Wai-Hong Tam <waihong@google.com>
Reviewed-by: Nick Sanders <nsanders@chromium.org>
11 files changed