it8380dev: fix i2c module

1. i2c interrupts are used.

Signed-off-by: Dino Li <dino.li@ite.com.tw>

BRANCH=none
BUG=none
TEST=1. console command 'i2cscan' found devices correctly.
     2. console command 'i2cxfer' and 'battery' OK.

Change-Id: I4d40488d482318128bc8c549f5c8d3c27abe4a04
Reviewed-on: https://chromium-review.googlesource.com/303001
Commit-Ready: Dino Li <dino.li@ite.com.tw>
Tested-by: Dino Li <dino.li@ite.com.tw>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
5 files changed