src: Remove unused 'include <cpu/x86/mtrr.h>'

Change-Id: I3f08b9cc34582165785063580b3356135030f63e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41782
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: David Guckian

src/cpu/intel/car/romstage.c

@@ -4,7 +4,6 @@
 #include <arch/romstage.h>
 #include <bootblock_common.h>
 #include <console/console.h>
-#include <cpu/x86/mtrr.h>
 #include <cpu/x86/smm.h>
 #include <arch/symbols.h>
 #include <commonlib/helpers.h>

src/cpu/intel/haswell/bootblock.c

@@ -3,7 +3,6 @@
 #include <stdint.h>
 #include <arch/bootblock.h>
 #include <cpu/x86/msr.h>
-#include <cpu/x86/mtrr.h>
 #include <arch/io.h>
 #include <halt.h>