{arch,cpu}: Remove redundant <arch/cpu.h>

<arch/cpu.h> is chain included through <cpu/cpu.h>.

Change-Id: I54a837394f67ac2a759907c7212ab947d07338dc
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60931
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <martinroth@google.com>

src/arch/x86/mpspec.c

@@ -6,7 +6,6 @@
 #include <arch/ioapic.h>
 #include <arch/smp/mpspec.h>
 #include <string.h>
-#include <arch/cpu.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/lapic.h>
 #include <drivers/generic/ioapic/chip.h>

src/cpu/intel/model_206ax/model_206ax_init.c

@@ -2,7 +2,6 @@
 
 #include <console/console.h>
 #include <device/device.h>
-#include <arch/cpu.h>
 #include <cpu/cpu.h>
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/msr.h>

src/cpu/x86/mp_init.c

@@ -3,7 +3,6 @@
 #include <console/console.h>
 #include <string.h>
 #include <rmodule.h>
-#include <arch/cpu.h>
 #include <commonlib/helpers.h>
 #include <cpu/cpu.h>
 #include <cpu/intel/microcode.h>