timers-core-2020-12-14

 Core:

  - Robustness improvements for the NOHZ tick management

  - Fixes and consolidation of the NTP/RTC synchronization code

  - Small fixes and improvements in various places

  - A set of function documentation udpates and fixes

 Drivers:

  - Cleanups and improvements in various clocksoure/event drivers

  - Removal of the EZChip NPS clocksource driver as the platfrom support
    was removed from ARC

  - The usual set of new device tree binding and json conversions

  - The RTC driver which have been acked by the RTC maintainer:

    - Fix a long standing bug in the MC146818 library code which can cause
      reading garbage during the RTC internal update.

    - The changes related to the NTP/RTC consolidation work.