Supports the EVL/Xenomai4 benchmarking tool as described in the
documentation. The benchmarking tool is accessed via the latmon service.
This code uses the J2 socket on FRDMk64-F:
PIN_20: tx pulse to SUT
PIN_18: rx ack from SUT
The client code running on the SUT shall monitor the falling edge of
PIN_20.
Example usage from the latmus client running Xenomai4:
$ latmus -I gpiochip2,23,falling-edge \
-O gpiochip2,21 -g"histogram" \
-z broadcast
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>
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