vboot: Jump to RW early

This change makes EC run vboot in the HOOK task. The vboot routine
requires battery and charger info. It waits in a deferred call
loop until the charge manager is initialized.

BUG=b:63586051
BRANCH=none
TEST=Verify the following cases:

A. Hardware reboot (type-c/BJ)
1. Unplug AC in S0 then plug in AC:     BOOT/BOOT
2. Unplug AC in S5 then plug in AC:     S5/S5
3. Unplug AC after A.2 then plug in AC: S5/S5
4. Press PB in S5:                      BOOT/BOOT

B. Software reboot (type-c/BJ)
1. Run EC reboot command in S0:        BOOT/BOOT
2. Run EC reboot command in S5:        BOOT/BOOT
3. Run EC reboot ap-off command in S0: S5/S5
4. Run EC reboot ap-off command in S5: S5/S5
5. Run host reboot command:            BOOT/BOOT
6. Run host shutdown command:          S5/S5

C. Recovery tests
1. Press RB and PB in S0:                        FAIL(*1)/PASS
2. Press RB and PB in S5:                        FAIL(*1)/PASS(*2)
3. Unplug AC in S0 then press RB and plug in AC: PASS/PASS
4. Unplug AC in S5 then press RB and plug in AC: PASS(*2)/PASS(*2)

*1: b:63668669
*2: b:63669512. Requires one more PB press.

Change-Id: I28f37fdad7f83d0d44570b9003e8c6a4b83b832f
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/568699
Reviewed-by: Randall Spangler <rspangler@chromium.org>

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