spring: Pull more current from video dongle
spring: Pull more current from video dongle

We cannot know how much current we can pull from video dongle, so let's
just try to pull as much as possible up to 2A.

BUG=chrome-os-partner:19324
TEST=Plug in video dongle and see 3.3V output.
TEST=Plug in video dongle with supplied charger, and see 50% PWM duty
cycle.
TEST=Plug in video dongle with normal charger, and see 70~80% PWM duty
cycle.
BRANCH=spring

Change-Id: I8b503f886fcafaa11e6757a5059ce673a8ed53cc
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50963
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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