timekeeping: Clean up ktime_get_real_ts64

In a move to make ktime_get_*() the preferred driver interface into the
timekeeping code, sanitizes ktime_get_real_ts64() to be a proper exported
symbol rather than an alias for getnstimeofday64().

The internal __getnstimeofday64() is no longer used, so remove that
and merge it into ktime_get_real_ts64().

Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: [email protected]
Cc: John Stultz <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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