240Mhz Support For ESP32-S3

[self-rep]

The driver ws2812_xtensa.go is currently broken with the following issues.

1. machine.CPUFrequency() does not work with the newer versions of tinygo.
   I suggest moving to freq, err := machine.GetCPUFrequency() with obvious error checking and running the switch off freq

2. driver ws2812 is not supported on the esp32-s3 as the S3 runs on a 240mhz clock speed rather than 160 or 80.

[self-rep]

I was able to get the driver to work by increasing the NOP by *1.5

based of the 160mhz case
37 x 1.5 = 56
55 x 1.5 = 82
72 x 1.5 = 108

[tomekc]

You can also lower frequency of S3 to 160Mhz.

_ = machine.SetCPUFrequency(160e6)

Regarding the ws2812 driver, I will send a PR that fixes it. Problem is, that S3 has dynamic frequency (can be changed in runtime) and simple constant no longer work as CPU clock value.