Fixes Path For Fan Control

[ay-privateer]

Jetpack R35
Jetson Nano Xavier NX

When I ran the benchmarks:

Traceback (most recent call last):
  File "benchmark.py", line 130, in <module>
    main()
  File "benchmark.py", line 28, in main
    system_check.run_set_clocks_withDVFS()
  File "/home/jetson/Documents/jetson_benchmarks/utils/utilities.py", line 53, in run_set_clocks_withDVFS
    self.set_clocks_withDVFS(frequency=self.gpu_freq, device='gpu')
  File "/home/jetson/Documents/jetson_benchmarks/utils/utilities.py", line 82, in set_clocks_withDVFS
    from_freq = self.read_internal_register(register=freq_register_, device=device)
  File "/home/jetson/Documents/jetson_benchmarks/utils/utilities.py", line 108, in read_internal_register
    reg_read = open(register, "r")
FileNotFoundError: [Errno 2] No such file or directory: '/sys/kernel/debug/bpmp/debug/clk/nafll_gpc0/rate'

This occurs because /sys/kernel/debug/bpmp/debug/clk/nafll_gpc0/rate does not exist in this version of jetpack. I noticed from the Nvidia documentation that fan control is done via hwmon: https://docs.nvidia.com/jetson/archives/r35.1/DeveloperGuide/text/SD/PlatformPowerAndPerformance/JetsonOrinNxSeriesAndJetsonAgxOrinSeries.html#fan-speed-control