cid: Switch to software based recovery mode

Some Cid platforms have intermittent problems detecting the hard
recovery mode signal from servo. Switch to software based mode
to avoid the issue.

BUG=chrome-os-partner:39334
TEST=run 'cros_workon --host start hdctools'
         'sudo emerge hdctools'
         'sudo servod --board=cid'
         'dut-control power_state:rec'

Change-Id: Ibc3d7f18dce775af6542fe1691e1122bcb569dec
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: https://chromium-review.googlesource.com/268648
Reviewed-by: Shawn N <shawnn@chromium.org>
(cherry picked from commit f85200bea07b477256f0a15536e7272897678658)
Reviewed-on: https://chromium-review.googlesource.com/270558
1 file changed