Draft: Revert "Remove ignored unaligned_references exception."

This reverts commit 50b877d1.

This fixes the ARM build.

The error in the broken state

error: reference to packed field is unaligned
   --> src/arch/aarch64/start.rs:107:36
    |
107 |         info!("Kernel: {:X}:{:X}", args.kernel_base, args.kernel_base + args.kernel_size);
    |                                    ^^^^^^^^^^^^^^^^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
    = note: fields of packed structs are not properly aligned, and creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
    = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
    = note: `#[deny(unaligned_references)]` on by default
    = note: this error originates in the macro `format_args` which comes from the expansion of the macro `info` (in Nightly builds, run with -Z macro-backtrace for more info)