Patch merged into coreboot/master: mainboard/google/reef: drop disabling periodic training for micron

the following patch was just integrated into master:
commit 6ea1500e48aa86ca0ae5da2227a65a3e5b5420db
Author: Aaron Durbin 
Date:   Tue Oct 25 15:19:54 2016 -0500

mainboard/google/reef: drop disabling periodic training for micron

In anticipation of getting fixed material remove the disabling of
    periodic training for MT53B512M32D2NP and MT53B256M32D1NP.

BUG=chrome-os-partner:59003

Change-Id: Iaadaa979d85cab78dda527db7480420af02fd832
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/17130
    Reviewed-by: Duncan Laurie 
    Reviewed-by: Furquan Shaikh 
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel

See https://review.coreboot.org/17130 for details.

-gerrit