Add support for system ID of position controller #36792

Job	Run time
build (base)	2m 52s
build (clang)	3m 16s
build-gcc-heli	3m 1s
autotest-heli (sitltest-heli)	15m 4s
autotest (sitltest-copter-tests1a)	12m 40s
autotest (sitltest-copter-tests1b)	14m 17s
autotest (sitltest-copter-tests1c)	15m 41s
autotest (sitltest-copter-tests1d)	12m 51s
autotest (sitltest-copter-tests1e)	14m 1s
autotest (sitltest-copter-tests2a)	13m 52s
autotest (sitltest-copter-tests2b)	28m 40s
	2h 16m 15s

Provide feedback