FMUv2: added define for MPU DRDY pin
FMUv2: set MPU6000 CS as initially de-selected
l3gd20: added I2C disable based on method from ST engineering support
lsm303d: added I2C disable based on method from ST engineering support
lsm303d: get cleaner logic traces by gathering all regs more regularly
lsm303d: cleanup logic traces by pre-zeroing all transfers
FMUv2: change CS pins to 2MHz

this gives cleaner traces
FMUv2: don't config ADC pins that are now used for MPU6k CS and other uses
lsm303d: make log distinctive with i2c disable included
lsm303d: changed tones for accel fail to 3 tones

distinct tones for init fail, post-boot fail and recovery
lsm303d: init filter to 773 Hz
Try to fix the LSM303D accel init
l3gd20: use highest possible on-chip filter bandwidth

this allows the software filter to do its job properly