Add new RP2350 microcontroller support

[acedogblast]

The Raspberry Pi Foundation unveiled the new RP2350 micro-controller a few days ago. A brief summary of changes and additions:

• Utilizes faster and more powerful Cortex-M33 cores (ARMv8 architecture + FPU).
• New RISC-V "hazard3" cores. Can't use ARM and RISC-V cores at the same time. Selected at the boot-loader.
• New security features. (Signed boot, encrypted firmware, SHA-256 accelerator, OTP non-volatile memory, True RNG)
• New package size (QFN-80) allows for more GPIO pins (RP235xB variants).
• Optional built-in flash 2MB (RP2354x variants).
• 520 kB of main system SRAM (near double from RP2040).
• Enhanced and expanded PIO. 3 PIO blocks with new instructions.
• TDMS encoder for DVI/HDMI output.
• Much more. See datasheet for all details.

Link to datasheet: https://datasheets.raspberrypi.com/rp2350/rp2350-datasheet.pdf
RP2350 is shipping now in the Pico 2 and 3rd party development boards.

[thejpster]

Yes, we know - but thank you for opening an issue so we can track the merge.

See https://thejpster.org.uk/blog/blog-2024-08-08/

[acedogblast]

Oh wow. That was fast. Thanks for your work to bring rust to the new rp chips.