Patch merged into coreboot/master: southbridge/amd/sb700: Add option to disable SATA ALPM

the following patch was just integrated into master:
commit 83b776137399bcfa9427e7a60d5f1620ee2d1985
Author: Timothy Pearson 
Date:   Thu Jun 18 11:48:02 2015 -0500

southbridge/amd/sb700: Add option to disable SATA ALPM

The AMD Register Programming Reference states that the user should
    have the option to disable Active Link Power Management for two
    reasons.  First, some drives may not function correctly with the
    ALPM implementation of the SP5100, and second there are some
    situations where low latency access is more important than the
    power savings created by using ALPM.

Allow the user to disable ALPM if desired.

Change-Id: I88055cbb4df4d7ba811cef7056c0a6ca2612fcb0
    Signed-off-by: Timothy Pearson 
    Reviewed-on: http://review.coreboot.org/11993
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/11993 for details.

-gerrit