[coreboot] Patch merged into coreboot/master: bb71c91 AMD S3: Rename generated s3.rom for make clean

the following patch was just integrated into master:
commit bb71c91db18ce60a6589ff563c1a23d8dd1e7e7f
Author: Zheng Bao 
Date:   Fri Dec 14 15:43:12 2012 +0800

AMD S3: Rename generated s3.rom for make clean

Add prefix coreboot_ to let make clean find it and delete it.

Change-Id: Ieba9c0e7ca3d2afec311d64159b22746ba5825c4
    Signed-off-by: Zheng Bao 
    Signed-off-by: zbao 
    Reviewed-on: http://review.coreboot.org/2029
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

Reviewed-By: Patrick Georgi  at Fri Dec 14 22:20:44 2012, giving +2
See http://review.coreboot.org/2029 for details.

-gerrit