[sensors] Minor tuning of hal definition

  * Swap GEOMAGNETIC_FIELD with MAGNETIC_FIELD for more accurate
    definition.
  * Remove redundunt prefixes in various enum definitions.
  * Clarify that string type will be removed for well defined sensor
    types. This avoid dependency on strings defined in sensors.h.
  * Added SensorFlagShift enum.
  * Remove unused flag parameter in batch.
  * Remove legacy setDelay function.
  * Change the type of sensor flag to bitfield<SensorFlagBits>, and
    use uint32_t since only low 32 bits are used.

Test: all sensor works(in marlin), tested with sensorlogger.

Change-Id: I93a4d13c5d2e054857d1e400d15002aeb9a47368