charge_manager: send EC_HOST_EVENT_PD_MCU at the end of refresh
charge_manager: send EC_HOST_EVENT_PD_MCU at the end of refresh

When kernel get EC_HOST_EVENT_PD_MCU event and query power state, we may
not done refresh here. Delay EC_HOST_EVENT_PD_MCU event to avoid this
race.

BUG=chrome-os-partner:59499
BRANCH=gru
TEST=Manual on kevin, check power state correct after unplug charger

Change-Id: Ib88acf5a39c2780c6e40144ccebfba17cf84f77c
Signed-off-by: Jeffy Chen <47d6898d69484cecf82b43667abe052526630c0f@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/408131
Commit-Ready: Douglas Anderson <49983c4a76b998672954ed5edf4a62db4a336502@chromium.org>
Tested-by: Wonjoon Lee <b961a80bc33bbc19346c547d1234eeb868c7ae74@samsung.com>
Reviewed-by: Douglas Anderson <49983c4a76b998672954ed5edf4a62db4a336502@chromium.org>
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec