Compiling on aarch64 fails with mismatched size for IdentifyControllerDataStructure

[PandaZ3D]

Compiling this library on a 64-bit ARM target fails. The compiler returns this error:

error[E0308]: mismatched types
   --> src/ds/identify/controller.rs:133:37
    |
133 | const _SIZE_CHECKER: [u8; 0x1000] = [0; std::mem::size_of::<IdentifyControllerDataStructure>()];
    |                           ------    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected an array with a fixed size of 4096 elements, found one with 4112 elements
    |                           |
    |                           help: consider specifying the actual array length: `4112`

This can be tested by cloning the repo and compiling it on a 64-bit ARM machine. This was tested with an ARM-based M1 Mac (Apple Darwin) and a Raspberry Pi 4 (Linux). It works fine on an x86_64 server, but does not compile on aarch64.

[dbittman]

Try cbddee4.

[PandaZ3D]

After playing around with it, something funky is definitely happening with the alignment/type layout. If I remove the repr(C), then its fine.