Add magic value for P4 (ESPTOOL-921)

[mutatrum]

The P4 on my dev board reports 0xFFFFFFFF as magic value. It's an engineering sample and it's self reporting as silicon version v0.1. I can't really judge if this should be merged though.

[github-actions]

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[radimkarnis]

Hi @mutatrum,
thanks for taking the time to report this, and even to send a PR!

We have recently found out that the magic number autodetection method is not reliable for ESP32-P4, as the value at the arbitrary address (CHIP_DETECT_MAGIC_REG_ADDR) can change between runs. Due to this, we are now considering changing the address (for all of the previous targets as well).

Fortunately, this is shouldn't be a big deal for P4, as autodetection based on the magic number is just a fallback method. The get_security_info method is primarily used and reliable.

[radimkarnis]

We will keep this issue open as a tracker until it's resolved.

Thanks again.