MPU9250 9DOF sensor in SPI mode support
mpu9250: destroy sensor queues when allocation fails
mpu9250: fixed file headers
mpu9250: corrected code style and whitespaces according style guide
Add I2C initializzation.

Signed-off-by: Giuseppe Barba <giuseppe.barba@gmail.com>
LSM9DS1: remove un-needed sleep into init functiony

Signed-off-by: Giuseppe Barba <giuseppe.barba@gmail.com>
DiscoveryF4: fix lsm9ds1 integration

Signed-off-by: Giuseppe Barba <giuseppe.barba@gmail.com>