Patch merged into coreboot/master: device: Add i2c read/write register field API

the following patch was just integrated into master:
commit d33ebd13741b7473e93a1a6780edbb1e2dca8258
Author: Yidi Lin 
Date:   Tue Mar 15 14:38:44 2016 +0800

device: Add i2c read/write register field API

i2c_read_field() - read the value from the specific register field
    i2c_write_field() - write the value to the specific register field

BRANCH=none
    BUG=none
    TEST=none

Change-Id: I2098715b4583c1936c93b3ff45ec330910964304
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 0817fc76d07491b39c066f1393a6435f0831b50c
    Original-Change-Id: I92c187a89d10cfcecf3dfd9291e0bc015459c393
    Original-Signed-off-by: Yidi Lin 
    Original-Reviewed-on: https://chromium-review.googlesource.com/332712
    Original-Reviewed-by: Julius Werner 
    Reviewed-on: https://review.coreboot.org/14105
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer 
    Reviewed-by: Martin Roth

See https://review.coreboot.org/14105 for details.

-gerrit