x86: Convert x86_platform_ops to timespec64

The x86 platform operations are fairly isolated, so it's easy to change
them from using timespec to timespec64. It has been checked that all the
users and callers are safe, and there is only one critical function that is
broken beyond 2106:

  pvclock_read_wallclock() uses a 32-bit number of seconds since the epoch
  to communicate the boot time between host and guest in a virtual
  environment. This will work until 2106, but fixing this is outside the
  scope of this change, Add a comment at least.

Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Boris Ostrovsky <[email protected]>
Acked-by: Radim Krčmář <[email protected]>
Acked-by: Jan Kiszka <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: [email protected]
Cc: Borislav Petkov <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: [email protected]
Cc: John Stultz <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Joao Martins <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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