Add support for the esp32p4

[floitsch]

No description provided.

[floitsch]

I need some help here. I have no idea what I'm doing...
Also, I think that the C3, C6, and S2 might need a different value too?

[floitsch]

With the default configuration the esp32-p4 crashes immediately.
If I disable cmpct-malloc, it manages to run a bit.
However, It has a tendency to run out of memory:

Heap report @ out of memory in 'stack grow' 216:324:
  ┌───────────┬──────────┬─────────────────────────────────────────────────────┐
  │   Bytes   │  Count   │  Type                                               │
  ├───────────┼──────────┼─────────────────────────────────────────────────────┤
  └───────────┴──────────┴─────────────────────────────────────────────────────┘
  Total: 0 bytes in 0 allocations (0%), largest free 376k, total free 439k

It looks like there is memory, but Toit doesn't recognize it.