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If our 32-bit usec timer is close to overflow, we may deep sleep several times in succession without making any adjustment to our count, causing deadlines on the other side (eg. HOOK_TICK expiration) to be reached much slower than expected. Avoid this by not entering deep sleep if our timer is about to overflow. This will result in a <= HOOK_TICK_INTERVAL (200ms interval) period of not entering deep sleep, every ~4300 seconds. BUG=chrome-os-partner:59240 BRANCH=gru TEST=Verify 3x kevin units survive 16 hours in S3 without EC watchdog. Change-Id: I2126458be8820f78212e19c2bb79242ff1194f6f Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/409673 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Shawn N <shawnn@chromium.org>