cpu/amd: Add initial AMD Family 15h support

TEST: Booted ASUS KGPE-D16 with single Opteron 6380
 * Unbuffered DDR3 DIMMs tested and working
 * Suspend to RAM (S3) tested and working

Change-Id: Idffd2ce36ce183fbfa087e5ba69a9148f084b45e
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/11966
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/iei/kino-780am2-fam10/romstage.c

@@ -121,7 +121,7 @@ void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx)
 
 	post_code(0x33);
 
-	cpuSetAMDMSR();
+	cpuSetAMDMSR(0);
 	post_code(0x34);
 
 	amd_ht_init(sysinfo);