When the system is turned off and then back on, we need to re-enable
3.3V output from TPS65090. Also, when we see 5V input, we should shut
down 3.3V output and re-enable it when 5V input goes away.
BUG=chrome-os-partner:18186, chrome-os-partner:18482
TEST=Manual
BRANCH=spring
Change-Id: I0cf0597a60988cc9ec28282eea54908c81e5eabc
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/47736
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>