chgstv2: optimization battery protection for low voltagefirmware-dedede-13606.516.B-master

Deep_charge_battery needs to precharge first, and then enter the idle or
charge state. Because before entering deep_charge_battery, the curr.state
state may be the idle state, which may cause no precharge process.
Therefore, add a flag to curr.batt.flags for record whether the precharge
process has been performed.

BRANCH=trogdor
BUG=b:263921114
TEST=After the battery is discharged below voltage_min, the charging
  process enters deep_charge_battery and precharges first, and when the
  battery voltage is greater than voltage_min, it enters the charge
  state and charges normally.
TEST=run-battery_get_params_smart

Change-Id: I3a353bbcb4149b873176006bc009fbd3e8824aab
Signed-off-by: Tang Qijun <qijun.tang@ecs.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4125706
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Commit-Queue: Bob Moragues <moragues@chromium.org>
(cherry picked from commit f0436fe4c66f1a6759c2ae28157ec495b53eab9c)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4212310
Reviewed-by: Shou-Chieh Hsu <shouchieh@chromium.org>
Reviewed-by: Owen Yang <owen.yang@ecs.corp-partner.google.com>
Commit-Queue: Ivan Chen <yulunchen@google.com>
Tested-by: Owen Yang <owen.yang@ecs.corp-partner.google.com>

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