change TX2 default scaling_governor to performance during bootup

Ref this topic, I also confirmed (JetPack3.2/tegra-l4t-r28.2.1) also disable CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE and enable CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE as deault.
https://devtalk.nvidia.com/default/topic/959247/jetson-tk1/cpu-clock-frequency-at-boot-time-nvidia-jetson-tk1/post/4968172/#4968172

After bootup, the scaling_governor and caling_cur_freq are not as expected.

nvidia@tegra-ubuntu:/$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
schedutil
schedutil
schedutil
schedutil
schedutil
schedutil                                                                      q
345600@tegra-ubuntu:/$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq 
1728000
1728000
345600
345600
345600

After do echo performance /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor, we get what we want.
How can we force scaling_governor as performance during boot up without any echo command again?

root@tegra-ubuntu:/# cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
performance
performance
performance
performance
performance
performance
root@tegra-ubuntu:/# cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
2035200
2035200
2035200
2035200
2035200
2035200

A simple method might be to add the nvpmodel and jetson_clocks content in “/etc/rc.local”.