boards: add support for nucleo-f439zi

[aabadie]

Contribution description

This PR adds support for another STM32 nucleo board, the nucleo-f439zi which is very similar to the nucleo-f429zi. It's also interesting because it provides an Ethernet port.

Testing procedure

• I tested all features provided except SPI, but according to the datasheet and board documentation the provided configuration is ok
• I ran compile_and_test_for_board.py and got the following result:

ERROR:nucleo-f439zi:Tests failed: 2
Failures during compilation:
- [tests/rust_minimal](tests/rust_minimal/compilation.failed)

Failures during test:
- [tests/malloc](tests/malloc/test.failed)

I don't understand the malloc failure but I get the same error on nucleo-f429zi. Maybe it's also related to #17439 because the error seems similar:

Allocated 128 Bytes at 0x0x2002fd70, total 170944
Allocated 128 Bytes at 0x0x2002fe08, total 171080
Allocated 128 Bytes at 0x0x2002fea0, total 171216
Allocated 128 Bytes at 0x0x2002ff38, total 171352
Allocated 128 Bytes at 0x0x2002ffd0, total 171488

Context before hardfault:
   r0: 0x2002ffd0
   r1: 0x00000040
   r2: 0x20030050
   r3: 0x20030001
  r12: 0x0000000a
   lr: 0x08000275
   pc: 0x080014de
  psr: 0x81000000

FSR/FAR:
 CFSR: 0x00000400
 HFSR: 0x40000000
 DFSR: 0x00000008
 AFSR: 0x00000000
Misc
EXC_RET: 0xfffffffd
Active thread: 1 "main"
Attempting to reconstruct state for debugging...
In GDB:
  set $pc=0x80014de
  frame 0
  bt

ISR stack overflowed by at least 16 bytes.

For the rust build failure, I think it's a toolchain issue locally (I didn't try with BUILD_IN_DOCKER=1)

Issues/PRs references

None

[benpicco]

It's also interesting because it provides an Ethernet port.

I assume you tested that one then? 😃

I don't understand the malloc failure

I also see this on stm32f429i-disco - it's unrelated to this PR but something seems to be really wrong with our heap configuration on STM32 😟

Simple addition, please rebase - then this can go in.

[aabadie]

I assume you tested that one then?

Sure, I just have to rebase to fix conflicts.

[aabadie]

I just have to rebase to fix conflicts.

Done