Patch merged into coreboot/master: southbridge/amd/sb700: Do drive detection even in AHCI mode

the following patch was just integrated into master:
commit 398540f568e24090f2e47aff90776c80c79f858b
Author: Timothy Pearson 
Date:   Sat Jun 20 21:31:15 2015 -0500

southbridge/amd/sb700: Do drive detection even in AHCI mode

SeaBIOS AHCI drive detection randomly fails for drives present
    on the secondary channel of each AHCI SATA BAR.  Forcing native
    drive detection in AHCI mode resolves this issue.

Change-Id: I34eb1d5d3f2f8aefb749a4eeb911c1373d184938
    Signed-off-by: Timothy Pearson 
    Reviewed-on: http://review.coreboot.org/11997
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/11997 for details.

-gerrit