ms5611: added "ms5611 test2"

this reports sudden changes in D1, useful for diagnosing temperature
related issues
FMUv2: set SPI GPIO pins on bus 1 to 50MHz

this solves the ms5611 issue related to temperature. We now need to
test if it is OK with all sensors
FMUv2: push SPI2 GPIO speed up to 50MHz as well