bd9995x: more delay time between chg_en and vsys_set
bd9995x: more delay time between chg_en and vsys_set

The nvdc voltage has a kind of deep, so that rarely observed
NVDC down at this point because of back-boosting.
Our sequence to enable charger bit and setting vsysreg
is correct but rohm introduce charger may need some more time
to be stable when between chg_en and vsys_set to start charge

BUG=chrome-os-partner:60380
BRANCH=gru
TEST=Manual on kevin, trigger battery disconnect, re-attach AC, verify
system boots cleanly. and see voltage probing on c54@60380

Change-Id: Ic05091379322ffaac16fe827a47345c76c85f3e5
Signed-off-by: Wonjoon Lee <b961a80bc33bbc19346c547d1234eeb868c7ae74@samsung.com>
Reviewed-on: https://chromium-review.googlesource.com/434252
Commit-Ready: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>
Tested-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@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