add defmt impls for core::ptr::NonNull and fn(...) -> Ret

[Crzyrndm]

Fixes #752

NonNull and fn pointers formatted like a raw pointer. This matches the behaviour of Debug for these types

[Urhengulas]

Thank you for your contribution @Crzyrndm.

Note: not quite sure where to add tests for the output?

Please add some log statements just before following line line and run cargo xtask test-snapshot --overwrite from the repository root:

defmt/firmware/qemu/src/bin/log.rs

Line 735 in d58633f

defmt::info!("QEMU test finished!");

Please also add this PR to the CHANGELOG.md.

[Crzyrndm]

Test prints added for NonNull, and fn pointers of 0/1/5 parameters for Rust/C/unsafe (formatting makes 12 a bit much, it's already noisy enough as is and the limit is about as arbitrary as it gets).

[Urhengulas]

Thank you!

bors r+

[bors]

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