Add ESP32-P4 support

[orsolic]

Continuation of mistakenly closed #2063

Here is commit with start of support for ESP32-P4.

I have started working on flashing support but I need to shelve that plan for the time being.
I am pushing the things which seems to work - patch is rough, but more will hopefully come later.

Tested with BMA and ESP-prog (FT2232H) on FreeBSD with Waveshare ESP32-P4 board with flashed IDF example.

Works:

• JTAG scan
• attach to target
• run program
• reset
• hardware breakpoint
• continue
• printing of var in SRAM

>>> p var
$4 = 123
>>> p &var
$5 = (uint32_t *) 0x4ff26334
>>> x /d 0x4ff26334
0x4ff26334:     123

• changing value of var:

>>> set var var = 100
>>> p var
$8 = 100
>>> x /d 0x4ff26334
0x4ff26334:     100

What doesn't work:

• software breakpoint (needs flash support)
• stepping
• single instruction stepping

[dragonmux]

This is looking much better 🙂. We've left a review reply on #2063 for one of the notes but have otherwise done a fresh review here. We are satisfied with the items you've addressed and mostly the items here are for subtle bugs we spotted.

We look forward to this being sorted so we can schedule its merge into v2.1 when the merge window opens for that.