[Sample; do not merge] Use low latency mode by default in C++ dir. #516
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This is sample implementation discussed in #511 .
ASYNC_LOW_LATENCYflag enables us to set/sys/bus/usb-serial/devices/ttyUSB0/latency_timerto 1 ms from C/C++ codes, instead of Method 1 and/or Method2 in the removed comments.