timekeeping: Add missing _ns functions for coarse accessors

This further unifies the accessors for the fast and coarse functions, so
that the same types of functions are available for each. There was also
a bit of confusion with the documentation, which prior advertised a
function that has never existed. Finally, the vanilla ktime_get_coarse()
was omitted from the API originally, so this fills this oversight.

Signed-off-by: Jason A. Donenfeld <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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