High resolution support

• Part 2 - add high resolution clock/timer

  • introduce subjiffy
  • a time instance is represented as
    jiffy + subjiffy
    
  • an additional timer interrupt allows setting interrupt at any time instance
    • Some arch’es multiplex one hardware timer for both
  • a cross architecture abstraction for subjiffy manipulations and hr timer interrupt setting
  • existing timer code is extended

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