[Feature request] Support 16 kHz PWM frequency on Tekko32_F3_C

[HunterCustom]

The Holybro Tekko32 F3 40A 4-in-1 ESC (Tekko32_F3_C firmware) ships with the PWM frequency set to 96 kHz, and the lowest it can be set is 48 kHz. Performance is terrible at 96 kHz, with very low authority at low throttle leading to large bobbles on throttle cuts. At 48 kHz, the performance is tolerable but still not very good. I am requesting the ability to reduce the PWM frequency farther to 16 kHz, if possible. I will be sending an email to tekko to have them update this in there system

[sskaug]

There is already testcode available here: https://github.com/bitdump/BLHeli/tree/master/BLHeli_32%20ARM/Half%20pwm%20low%20frequency%20testcode This code does not go down to 16k. What it does is to use half the pwm freq low of what the Suite says. So if you set pwm freq low to 48k in the Suite, it is actually 24k.