cpu/amd: Use common AMD's MSR

Phase 1. Due to the size of the effort, this CL is broken into several
phases.

Change-Id: I0236e0960cd1e79558ea50c814e1de2830aa0550
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/29065
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>

src/soc/amd/stoneyridge/northbridge.c

@@ -26,6 +26,7 @@
 #include <cpu/cpu.h>
 #include <cpu/x86/lapic_def.h>
 #include <cpu/x86/msr.h>
+#include <cpu/amd/msr.h>
 #include <device/device.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>