AMD Steppe Eagle: CPU files for new SoC

Add the CPU files required to support the Steppe Eagle and Mullins
models of Family 16h SoC processors from AMD.  This CPU is based on
the Jaguar core and is similar to Kabini.

Change-Id: Ib48a3f03128f99a1242fe8c157e0e98feb53b1ea
Signed-off-by: Bruce Griffith <Bruce.Griffith@se-eng.com>
Reviewed-on: http://review.coreboot.org/6679
Tested-by: build bot (Jenkins)
Reviewed-by: WANG Siyuan <wangsiyuanbuaa@gmail.com>
Reviewed-by: Zheng Bao <zheng.bao@amd.com>

src/include/cpu/x86/lapic_def.h

@@ -6,8 +6,12 @@
 #define LAPIC_BASE_MSR_ENABLE (1 << 11)
 #define LAPIC_BASE_MSR_ADDR_MASK 0xFFFFF000
 
+#ifndef LOCAL_APIC_ADDR
 #define LOCAL_APIC_ADDR 0xfee00000
+#endif
+#ifndef LAPIC_DEFAULT_BASE
 #define LAPIC_DEFAULT_BASE LOCAL_APIC_ADDR
+#endif
 
 #define LAPIC_ID		0x020
 #define LAPIC_LVR	0x030