hrtimers/tick/clockevents: Remove sloppy license references

"For licencing details see kernel-base/COPYING" and similar license
references have no value over the SPDX identifier. Remove them.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Kees Cook <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Acked-by: John Stultz <[email protected]>
Acked-by: Corey Minyard <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Kate Stewart <[email protected]>
Cc: Philippe Ombredanne <[email protected]>
Cc: Peter Anvin <[email protected]>
Cc: Russell King <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Nicolas Pitre <[email protected]>
Cc: David Riley <[email protected]>
Cc: Colin Cross <[email protected]>
Cc: Mark Brown <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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