AP_Mount: zoom for Viewpro IR sensor #42883

Job	Run time
build (base)	2m 22s
build (clang)	2m 18s
build-gcc-heli	2m 22s
autotest (sitltest-copter-tests1a)	7m 30s
autotest (sitltest-copter-tests1b)	9m 35s
autotest (sitltest-copter-tests1c)	11m 33s
autotest (sitltest-copter-tests1d)	9m 42s
autotest (sitltest-copter-tests1e)	9m 58s
autotest (sitltest-copter-tests2a)	9m 23s
autotest (sitltest-copter-tests2b)	30m 51s
autotest-heli (sitltest-heli)	10m 33s
	1h 46m 7s

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