Allow sensor detection on multiple I2C buses #1816
Description
As seen in #1810 and also previously with REVO/AIRBOTF4 targets, we lack the possibility to looks for sensors on multiple I2C buses.
Sensor as a type is pinned to a bus and code fails to use even different sensor of the same type on different I2C bus.
We should either pin exact hardware to a bus or scan all buses in hope for success.
In first solution instead of
#define BARO_I2C_INSTANCE I2C_DEVICE_EXT
we would have
#define MS5611_I2C_INSTANCE I2C_DEVICE_EXT
In the second solution:
#define BARO_I2C_INSTANCE I2C_DEVICE | I2C_DEVICE_EXT (or something like that)