spring: Shorten delay for charger redetect
spring: Shorten delay for charger redetect

It takes ~250ms for TSU6721 to recognize a CDP charger. Let's shorten
the redetecting delay from 4 seconds to 600ms so that:
  1. A CDP charger is recognized faster
  2. We can properly detect overcurrent for CDP charger

BUG=chrome-os-partner:21388
TEST=Plug in a CDP charger and see it recognized after 600ms.
BRANCH=Spring

Change-Id: Id5020132686f8cfabb126e2fb57e7e75e3868775
Original-Change-Id: Iafbc677fbcdd4eb9e6cf276cc0219b965eb35ef5
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/63814
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/64277

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