arch/x86/cpu_common.c: Remove unneeded headers

Change-Id: I4f57376138725804133059c785e89e095fd6a759
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/26000
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/arch/x86/cpu_common.c

@@ -15,8 +15,6 @@
 #include <cpu/cpu.h>
 #include <arch/io.h>
 #include <string.h>
-#include <cpu/x86/mtrr.h>
-#include <cpu/x86/msr.h>
 #include <cpu/x86/lapic.h>
 #include <arch/cpu.h>
 #include <device/path.h>