rust: dma: generalize BinaryWriter impl for Coherent<T>

Generalize the BinaryWriter implementation from Coherent<[u8]> to
Coherent<T> where T: KnownSize + AsBytes + ?Sized. The implementation
only uses size() and write_dma(), neither of which depends on the
inner type being a byte slice.

This allows any Coherent allocation with an AsBytes inner type to be
exposed as a debugfs binary file.

Acked-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20260325003921.3420-2-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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