Patch merged into coreboot/master: b2cddd4 ASUS F2A85-M: romstage.c: Set RAM voltage for non 1.5 Volt case

the following patch was just integrated into master:
commit b2cddd4c12d99df55a1fd856cceea27372ce3f69
Author: Paul Menzel 
Date:   Sun May 5 12:09:16 2013 +0200

ASUS F2A85-M: romstage.c: Set RAM voltage for non 1.5 Volt case

Currently the code in the if statement

if (!byte)
        	do_smbus_write_byte(0xb20, 0x15, 0x3, byte);

only gets executed if `byte == 0x0`, that means only in the
    default case where RAM voltage is 1.5 Volts. But the RAM voltage
    should be changed when configured for the non-default case.

So negate the predicate to alter the RAM voltage for the
    non-default cases.

To prevent the build error

OBJCOPY    cbfs/fallback/coreboot_ram.elf
        coreboot-builds/asus_f2a85-m/generated/crt0.romstage.o: In function `cache_as_ram_main':
        /srv/jenkins/.jenkins/jobs/coreboot-gerrit/workspace/src/mainboard/asus/f2a85-m/romstage.c:106: undefined reference to `do_smbus_write_byte'
        collect2: error: ld returned 1 exit status
        make: *** [coreboot-builds/asus_f2a85-m/cbfs/fallback/romstage_null.debug] Error 1

add `southbridge/amd/agesa/hudson/smbus.c` providing the function
    `do_smbus_write_byte` to ROM stage in `Makefile.inc`. That can
    actually be used after the needed header files are included in a
    previous commit.

Change-Id: I89542479c4cf6d412614bcf4586ea98e097328d6
    Reported-by: David Hubbard 
    Signed-off-by: Paul Menzel 
    Reviewed-on: http://review.coreboot.org/3200
    Tested-by: build bot (Jenkins)
    Reviewed-by: Martin Roth

See http://review.coreboot.org/3200 for details.

-gerrit