rust: io: convert ResourceSize into a transparent newtype

`ResourceSize` is a bare type alias for `resource_size_t`, so it
inherits every integer operation and `as` cast. That allows operations
that make no sense for the size of a hardware resource, such as mixing
it with unrelated integers or truncating it with a cast.

Wrap it in a `#[repr(transparent)]` newtype so each conversion at a
boundary is explicit. The representation is unchanged, so this is
ABI-identical; only the spelling at the FFI boundary changes. Provide
`from_raw`/`into_raw`, `From` in both directions, and a fallible
`TryFrom<ResourceSize> for usize`, since `resource_size_t` can be wider
than `usize` on 32-bit.

Update the producer, `Resource::size`, and its consumers in `Region`
and `request_region`.

Suggested-by: Miguel Ojeda <ojeda@kernel.org>
Link: https://github.com/Rust-for-Linux/linux/issues/1203
Signed-off-by: Lorenzo Delgado <lnsdev@proton.me>
Link: https://patch.msgid.link/20260927-resource-size-newtype-v4-2-447a08af23fb@proton.me
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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