timers-core-2022-03-21

 Core code:

    - Make the NOHZ handling of the timekeeping/tick core more robust to
      prevent a rare jiffies update stall.

    - Handle softirqs in the NOHZ/idle case correctly

 Drivers:

    - Add support for event stream scaling of the 1GHz counter on ARM(64)

    - Correct an error code check in the timer-of layer

    - The usual cleanups and improvements all over the place