Replace the creation of uuid string with the board common api
  board_get_uuid_formated32 as opposed to using mcu_unique_id
  and printf.

   Using board cvommon UUID api thefore Removed mcu_unique_id

   This abstraction will support mcu's with longer ID's then the
   stm32 family.

   It provids a common interface for byte and 32 bit word access
   to the UUID data and a facility to reorder it.

* Streamline python script for temp cal.

* Simplify file generation for temp calibration.