lulu: Switch to software based recovery mode

Lulu platforms with 8GB have timing 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=lulu'
         'dut-control power_state:rec'

Change-Id: I42a474f3eb50750f11d23b2780bce7b5e51a1021
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: https://chromium-review.googlesource.com/270267
Reviewed-by: Bernie Thompson <bhthompson@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>
(cherry picked from commit 97f6f82efc11e266bee1c80c3889a638ce1aadee)
Reviewed-on: https://chromium-review.googlesource.com/270575
1 file changed