cpu: Include <cpu/cpu.h> instead of <arch/cpu.h>

Also sort includes.

Change-Id: Ia4a3807e45777e2a596878fe09e3c80b1fd2704d
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69037
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>

src/cpu/intel/microcode/microcode.c

@@ -2,9 +2,9 @@
 
 /* Microcode update for Intel PIII and later CPUs */
 
-#include <arch/cpu.h>
 #include <cbfs.h>
 #include <console/console.h>
+#include <cpu/cpu.h>
 #include <cpu/intel/microcode.h>
 #include <cpu/x86/msr.h>
 #include <smp/spinlock.h>