Use sample time in Attitude logging #39646

Job	Run time
build (base)	5m 28s
build (clang)	5m 30s
build-gcc-heli	5m 29s
autotest (sitltest-copter-tests1a)	8m 28s
autotest (sitltest-copter-tests1b)	10m 31s
autotest (sitltest-copter-tests1c)	12m 35s
autotest (sitltest-copter-tests1d)	9m 51s
autotest (sitltest-copter-tests1e)	9m 43s
autotest (sitltest-copter-tests2a)	9m 56s
autotest (sitltest-copter-tests2b)	31m 14s
autotest-heli (sitltest-heli)	10m 31s
	1h 59m 16s

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