mpu9250: Do a reasonable post chip init validations, reporting errors
mpu9250: Do a reasonable post chip init validations, reporting errors

   Check that the mpu9250's configured registers match the settings
   written to them. Attempt to fix any that do not up to 3 times.
   printing erros to the console on mismatches and returning
   faliure if after 3 attempts the any of the values are
   still wrong.

PX4/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,dagar/Firmware,dagar/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,krbeverx/Firmware,dagar/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,dagar/Firmware,Aerotenna/Firmware,PX4/Firmware,krbeverx/Firmware,Aerotenna/Firmware,PX4/Firmware,PX4/Firmware,acfloria/Firmware,Aerotenna/Firmware,dagar/Firmware,Aerotenna/Firmware,acfloria/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,PX4/Firmware,krbeverx/Firmware,jlecoeur/Firmware,dagar/Firmware,acfloria/Firmware,jlecoeur/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,mcgill-robotics/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,PX4/Firmware,krbeverx/Firmware,mcgill-robotics/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware