AP_Baro: Add a step number to the message #31727

Job	Run time
build (base)	4m 2s
build (clang)	3m 22s
build-gcc-heli	3m 15s
autotest (sitltest-copter-tests1a)	15m 16s
autotest (sitltest-copter-tests1b)	17m 8s
autotest (sitltest-copter-tests1c)	16m 15s
autotest (sitltest-copter-tests1d)	15m 2s
autotest (sitltest-copter-tests1e)	16m 52s
autotest (sitltest-copter-tests2a)	16m 37s
autotest (sitltest-copter-tests2b)	27m 33s
autotest-heli (sitltest-heli)	21m 3s
	2h 36m 25s

Provide feedback