HV: per_cpu: drop dependency on version.h and add license header

version.h is included but not used by per_cpu.h. This results in a forceful
rebuild of almost all files because per_cpu.h (and thus version.h) is depended
on by many files, and version.h is created every time a build is triggered.

This patch breaks this dependency. No further changes needed as sources using
version.h all include that file explicitly.

Also add the missing license header BTW.

Signed-off-by: Junjie Mao <junjie.mao@intel.com>

Author: junjiemao1

hypervisor/include/arch/x86/per_cpu.h

@@ -1,9 +1,15 @@
+/*
+ * Copyright (C) 2018 Intel Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
 #ifndef PER_CPU_H
 #define PER_CPU_H
+
 #include <hypervisor.h>
 #include <bsp_extern.h>
 #include <schedule.h>
-#include <version.h>
 #include <common/irq.h>
 #include <arch/x86/irq.h>
 #include <sbuf.h>
@@ -52,4 +58,5 @@ extern uint64_t pcpu_active_bitmap;
 
 /* get percpu data for current pcpu */
 #define get_cpu_var(name)	per_cpu(name, get_cpu_id())
+
 #endif