Patch merged into coreboot/master: google/chell: Adjust nuvoton 8825 button thresholds again.

the following patch was just integrated into master:
commit 473e0c35fe2ecd70ed791936e65d8924f16e528c
Author: Benson Leung 
Date:   Tue Mar 22 13:37:51 2016 -0700

google/chell: Adjust nuvoton 8825 button thresholds again.

Changing these thresholds again for new tuning in March of 2016.
    Something's changed in the latest firmware to cause all
    values previously read on Chell to float down.

Set "nuvoton,sar-threshold" property to thresholds
    based on tuning with the Android Wired Headphone
    Compatibility Kit and Chell DVT.

Signed-off-by: Benson Leung

BUG=chrome-os-partner:49333
    BRANCH=none
    TEST=Run evtest, selecting the input event for sklnau8825adi
    Using the Nominal headphones from the kit, check that the
    buttons for "KEY_VOLUMEDOWN", "KEY_VOLUMEUP", "KEY_MEDIA",
    and code 582 (?) (should be voice search, but evtest doesn't understand)
    All of these buttons should work properly.

Change-Id: Ie5ff1d35599d2cca5ce76467ecd7ec3ecab42d8b
    Signed-off-by: Patrick Georgi 
    Original-Commit-Id: 1d13e967addb5cd31e6196e32541cda97ae00257
    Original-Change-Id: I11de7a0853a3598f3834e8bae3140b9942cbd0b0
    Original-Reviewed-on: https://chromium-review.googlesource.com/334402
    Original-Commit-Ready: Benson Leung 
    Original-Tested-by: Benson Leung 
    Original-Reviewed-by: Duncan Laurie 
    Reviewed-on: https://review.coreboot.org/14233
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Martin Roth

See https://review.coreboot.org/14233 for details.

-gerrit