The previous method made too optimistic assumptions about the resolution of 32 bit floating point numbers.

And destroy the semaphore if startup fails.

Credits for finding this go to @jeonghwan-lee

      Removed that driver was only referenced from the now depricated
      px4fmuv-1

  Removed that driver was only referenced from the now depricated
  px4fmuv-1

   Use PX4 log and module documantation
   Fixed memory leaks

   Removed FMUv1 and px4io-v1, defaulting to px4io-v2
   were appicable.

   Removed conditional compilation for FMUv1 and defaulted to
   FMUv2.

  Comment expressly referenced PX4FMUv1, but the EEPROM,
  could be used on any board.