Dynamic FIFO Buffering #42556

Job	Run time
build-gcc-heli	5m 16s
build (base)	5m 19s
build (clang)	5m 44s
autotest-heli (sitltest-heli)	12m 27s
autotest (sitltest-copter-tests1a)	10m 42s
autotest (sitltest-copter-tests1b)	12m 2s
autotest (sitltest-copter-tests1c)	14m 11s
autotest (sitltest-copter-tests1d)	11m 31s
autotest (sitltest-copter-tests1e)	12m 7s
autotest (sitltest-copter-tests2a)	11m 38s
autotest (sitltest-copter-tests2b)	31m 56s
	2h 12m 53s

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