Add support for the ESP32-P4

[jessebraham]

Still no ETA on this chip, however it's next in line.

Hoping to get my hands on some hardware early in the new year (2024).

Devkits are now available.

Status

• Create an SVD
• Create a PAC
• Add support to ancillary crates (esp-backtrace, esp-println)
  • Add support for the ESP32-P4 esp-println#61
  • Add support for ESP32-P4 esp-backtrace#47
• Create a HAL package
  • Add initial support for the ESP32-P4 #1101
• Get existing drivers building for all peripherals
  • Adding clock support for ESP32-P4 #1145
  • Implement UART support for ESP32-P4 #1150
• Final review and publication

[jessebraham]

SVD has been created: https://github.com/espressif/svd/blob/main/svd/esp32p4.svd
PAC has been created: https://github.com/esp-rs/esp-pacs/tree/main/esp32p4

Should have hardware soon, I hope. Once I have acquired a devkit I will try to get a minimal application together so we can finish updating esp-println/esp-backtrace, and then will PR the minimal esp32p4-hal package so that others can collaborate on this.

[jessebraham]

My devkits have finally arrived, so I have begun work on this.

[jessebraham]

Initial support added in #1101. Doesn't do anything yet, but serves as a starting point for other work.