asurada: increase i2c freq to 400Khz
asurada: increase i2c freq to 400Khz

This CL increase the i2c freq to 400Khz to finish the i2c task, and
let it81202 enter the doze state faster.

BUG=b:173490375
TEST=ensure S3 power consumption drop to 5mw
BRANCH=none

Change-Id: Iee12f61075214b7f585a9b7d2c2ad6f64666d4f2
Signed-off-by: Eric Yilun Lin <2f2733c7206ea2b76bd2db1905cc5e8a75841c48@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2607967
Reviewed-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec