`svd2rust` issues with `VolatileCell`

[Ddystopia]

As far as I can understand from here, there are issues with using "VolatileCell" in svd2rust, and it is not really going to change. Maybe slowly move away from it?

[burrbull]

Initial implementation of raw unsafe register access:
rust-embedded/svd2rust#841
Not tested as nobody interested.