cpu/intel/model_1067x: Drop <cpu/x86/mp.h> include

Found using:
diff <(git grep -l 'include <cpu/x86/mp.h>' -- src) <(git grep -l 'CACHELINE_SIZE\|cpu_info\|mfence\|mfence\|mp_ops\|mp_init_with_smm\|MP_RUN_ON_ALL_CPUS\|mp_run_on_aps\|mp_run_on_all_cpus\|mp_park_aps\|smm_initiate_relocation_parallel\|smm_initiate_relocation' -- src/) |grep '<'

Change-Id: Ib721e667144d6803261f3761a077570e0e27391d
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42395
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/cpu/intel/model_1067x/model_1067x_init.c

@@ -4,7 +4,6 @@
 #include <device/device.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/msr.h>
-#include <cpu/x86/mp.h>
 #include <cpu/x86/lapic.h>
 #include <cpu/intel/speedstep.h>
 #include <cpu/x86/cache.h>