[coreboot-gerrit] Patch merged into coreboot/master: b7f328f samus: Use codec internal 1.8V as DACREF source

the following patch was just integrated into master:
commit b7f328f6a2a9985a66f6df603e46cda531f933c4
Author: Ben Zhang 
Date:   Wed Dec 10 17:44:18 2014 -0800

samus: Use codec internal 1.8V as DACREF source

This is needed for audio playback after we disconnect PP1800_CODEC
    from DACREF to avoid noise coupled on PP1800_CODEC, which makes
    recording noisy.

For recording, DACREF comes from mic vref pump voltage.
    For playback, DACREF comes from internal 1.8V.

BUG=chrome-os-partner:32953
    BRANCH=samus
    TEST=Set MICBIAS to 2.970V on Samus, playback/recording is clean

Change-Id: I65fb6dbfab54c7c4de6496fd4a0d666baead28ec
    Signed-off-by: Stefan Reinauer 
    Original-Commit-Id: 3e62a61f6cf6042f6d653a827698b55ac86e2d2b
    Original-Change-Id: I27430691e469dd7f4056d99438ce080062b58b9a
    Original-Signed-off-by: Ben Zhang 
    Original-Signed-off-by: Duncan Laurie 
    Original-Reviewed-on: https://chromium-review.googlesource.com/241179
    Reviewed-on: http://review.coreboot.org/9500
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See http://review.coreboot.org/9500 for details.

-gerrit