Revert "cheza: Support confirmation of power lost"

This reverts commit 548e4d9708cc4402497ed290daf4df672114302c.

The following CL uses the POWER_GOOD signal as an indicator, instead of
the AP_RST_L which has a short low pulse during warm reset. So revert
the confirmation logic for the AP_RST_L.

BRANCH=none
BUG=b:78455067
TEST=Check the following CL.

Change-Id: Iec0a7592f8dd1686b1bce8304b42ad0407b6dfde
Signed-off-by: Wai-Hong Tam <waihong@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1169952
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
3 files changed