base_detect: Expose console command to force state.

In an effort to test wake sources on any given platform, this
CL exposes console command to set the base state. This console
command can then be invoked by autottests from the uart interface.
We have two implementations for managing base status.  One is interrupt
driven while the other is a polling via a task.

Boards current implementations then are:

  interrupts: lux, soraka, cheza
  polling task: nocturne, zoombini

For forcing base connect and disconnect,

  interrupts: Disable interrupts and set forced base state.
  polling task: Stop periodic task and set forced base state.

On reset,

  interrupts: Schedule deferred task immediately and enable interrupts.
  polling task: Clear forced base state and begin rescheduling periodic
                task.

Signed-off-by: RaviChandra Sadineni <ravisadineni@google.com>
BRANCH=poppy,nocturne
BUG=chromium:820668, b:37223093
TEST=Tested on lux, soraka and nocturne
             basestate  a : attaches the lid, reflected in ui.
             basestate  d : detaches the lid, reflected in ui.
             basestate  r : resets to the correct state.
     Wakes the device up on lux and nocturne and soraka.

orig-Change-Id: Iab698e103a50b8d22bf216a6f816998cb158e38a
orig-Reviewed-on: https://chromium-review.googlesource.com/1184172

Change-Id: I13a12c302fb6c50b11a70f15c218eb72079f2c17
Reviewed-on: https://chromium-review.googlesource.com/1240456
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
Commit-Queue: Ravi Chandra Sadineni <ravisadineni@chromium.org>
Tested-by: Ravi Chandra Sadineni <ravisadineni@chromium.org>
Trybot-Ready: Ravi Chandra Sadineni <ravisadineni@chromium.org>

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