Consider using TRNG for RP2350

[deshipu]

The RP2350 has a new peripheral for a true random generator, it could be nice to make use of it.

[jepler]

Based on a quick perusal of the 2350 datasheet the 2040 compatible "rosc randombit" generator should work with the new chip but using the new hw module mother be faster or something.

[jepler]

Better yet switch to pico rand from the sdk and delete my "crypto" code from circuitpthon. It will select the right hw mode for generating random bytes

[jepler]

I would probably drop this from the 9.2.0 milestone. While I don't actually have any RP2350 hardware for testing, I believe the ROSC based RNG is currently working on both chips, so this is not urgent missing functionality.