spring: Hard-limit DCP current at 1.5A
spring: Hard-limit DCP current at 1.5A

The spec suggests we cannot reliably go over 1.5A and gracefully
recover. Let's avoid going over that limit.

BUG=chrome-os-partner:19267
TEST=Build spring
BRANCH=spring

Change-Id: I07411ff3ce4107e0289c5af5365ef5a23fd23e4e
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50321
Reviewed-by: Vincent Palatin <70a9964ec8fd10b0b08fcc8623c2add25ddf99ac@chromium.org>

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