Patch merged into coreboot/master: reef: tune tpm i2c frequency to 400kHz

the following patch was just integrated into master:
commit 242cb3b601396a5178680f7731b8d5f9d257c646
Author: Aaron Durbin 
Date:   Thu Nov 3 08:34:23 2016 -0500

reef: tune tpm i2c frequency to 400kHz

This brings the frequency down to 400kHz which is spec for
    fast i2c.

BUG=chrome-os-partner:58889

Change-Id: I8689a062b5457aa431eaa7fb688a7170dad83fcf
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/17214
    Reviewed-by: Duncan Laurie 
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel

See https://review.coreboot.org/17214 for details.

-gerrit