src: Move shared amd64 and IA32 MSRs to <cpu/x86/msr.h>

Change-Id: Ic9022a98878a2fcc85868a64aa9c2ca3eb2e2c4e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/29177
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/northbridge.c

@@ -22,7 +22,6 @@
 #include <chip.h>
 #include <console/console.h>
 #include <cpu/amd/mtrr.h>
-#include <cpu/amd/amdfam15.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/lapic_def.h>
 #include <cpu/x86/msr.h>