David Sidrane ab43baa02d Clean up Crazyflie
1) Remove uneeded spi and reset code
   2) Use the Board commin for providing the BOARD_NAME
   3) Add PX4_PWM_ALTERNATE_RANGES in suport of a board agnostic
      way to override the PWM_.*_{MIN|MAX} values
   4) Remove #ifdefs from the IO timers*. Drive the config deltas
      from the crazyflie_timer_config.c and one board agnostic
      ifdef PX4_IO_TIMER_ALTERNATE_RATE that is non board specific

      *I would like to eliminate PX4_IO_TIMER_ALTERNATE_RATE
      as well, but I need HW to validate that the startup
      script can just set the rate on the PWM to 3921 fast
      enough to not effect the motors.
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