rust: ptr: remove implicit index projection syntax

All users have been converted to use keyworded index projection syntax to
explicitly state their intention when doing index projection.

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Gary Guo <gary@garyguo.net>
Acked-by: Danilo Krummrich <dakr@kernel.org>
Link: https://patch.msgid.link/20260602-projection-syntax-rework-v2-6-6989470f5440@garyguo.net
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: nbdd0121

rust/kernel/dma.rs

@@ -1210,12 +1210,6 @@ macro_rules! dma_write {
     (@parse [$dma:expr] [$($proj:tt)*] [[$flavor:ident: $index:expr] $($rest:tt)*]) => {
         $crate::dma_write!(@parse [$dma] [$($proj)* [$flavor: $index]] [$($rest)*])
     };
-    (@parse [$dma:expr] [$($proj:tt)*] [[$index:expr]? $($rest:tt)*]) => {
-        $crate::dma_write!(@parse [$dma] [$($proj)* [$index]?] [$($rest)*])
-    };
-    (@parse [$dma:expr] [$($proj:tt)*] [[$index:expr] $($rest:tt)*]) => {
-        $crate::dma_write!(@parse [$dma] [$($proj)* [$index]] [$($rest)*])
-    };
     ($dma:expr, $($rest:tt)*) => {
         $crate::dma_write!(@parse [$dma] [] [$($rest)*])
     };

rust/kernel/ptr/projection.rs

@@ -351,14 +351,6 @@ macro_rules! project_pointer {
         $crate::ptr::project!(@gen $ptr, $($rest)*)
     };
 
-    // For compatibility
-    (@gen $ptr:ident, [$index:expr]? $($rest:tt)*) => {
-        $crate::ptr::project!(@gen $ptr, [try: $index] $($rest)*)
-    };
-    (@gen $ptr:ident, [$index:expr] $($rest:tt)*) => {
-        $crate::ptr::project!(@gen $ptr, [build: $index] $($rest)*)
-    };
-
     (mut $ptr:expr, $($proj:tt)*) => {{
         let ptr: *mut _ = $ptr;
         $crate::ptr::project!(@gen ptr, $($proj)*);