rust: dma: add type alias for bindings::dma_addr_t

rust: dma: add type alias for bindings::dma_addr_t

Add a type alias for bindings::dma_addr_t (DmaAddress), such that we do
not have to access bindings directly.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Suggested-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20250828133323.53311-3-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>