treewide: Remove unused <cpu/x86/msr.h>

Change-Id: I187c2482dd82c6c6d1fe1cbda71710ae1a2f54ad
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64890
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/security/intel/txt/ramstage.c

@@ -7,7 +7,6 @@
 #include <cbfs.h>
 #include <console/console.h>
 #include <cpu/intel/common/common.h>
-#include <cpu/x86/msr.h>
 #include <cpu/x86/smm.h>
 #include <device/pci_ops.h>
 #include <security/intel/cbnt/cbnt.h>