rust: sizes: add commonly used constants

Add rust equivalent to include/linux/sizes.h, makes code more
readable. Only SZ_*K that QT2025 PHY driver uses are added.

Make generated constants accessible with a proper type.
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

rust/kernel/lib.rs

@@ -43,6 +43,7 @@
 pub mod page;
 pub mod prelude;
 pub mod print;
+pub mod sizes;
 mod static_assert;
 #[doc(hidden)]
 pub mod std_vendor;

rust/kernel/sizes.rs

+// SPDX-License-Identifier: GPL-2.0
+
+//! Commonly used sizes.
+//!
+//! C headers: [`include/linux/sizes.h`](srctree/include/linux/sizes.h).
+
+/// 0x00000400
+pub const SZ_1K: usize = bindings::SZ_1K as usize;
+/// 0x00000800
+pub const SZ_2K: usize = bindings::SZ_2K as usize;
+/// 0x00001000
+pub const SZ_4K: usize = bindings::SZ_4K as usize;
+/// 0x00002000
+pub const SZ_8K: usize = bindings::SZ_8K as usize;
+/// 0x00004000
+pub const SZ_16K: usize = bindings::SZ_16K as usize;
+/// 0x00008000
+pub const SZ_32K: usize = bindings::SZ_32K as usize;
+/// 0x00010000
+pub const SZ_64K: usize = bindings::SZ_64K as usize;
+/// 0x00020000
+pub const SZ_128K: usize = bindings::SZ_128K as usize;
+/// 0x00040000
+pub const SZ_256K: usize = bindings::SZ_256K as usize;
+/// 0x00080000
+pub const SZ_512K: usize = bindings::SZ_512K as usize;