gpu: nova-core: bitfield: remove BitOr implementation

Using this operand can produce invalid values. It also doesn't bring
any benefit as one can use the builder pattern to assemble a new value.

Reported-by: Edwin Peer <[e-mail]>
Link: https://lore.kernel.org/rust-for-linux/[e-mail]/
Reviewed-by: Joel Fernandes <[e-mail]>
Reviewed-by: Danilo Krummrich <[e-mail]>
Signed-off-by: Alexandre Courbot <[e-mail]>
Message-ID: <[e-mail]>

drivers/gpu/nova-core/bitfield.rs

···
     // All rules below are helpers.
 
     // Defines the wrapper `$name` type, as well as its relevant implementations (`Debug`,
-    // `Default`, `BitOr`, and conversion to the value type) and field accessor methods.
+    // `Default`, and conversion to the value type) and field accessor methods.
     (@core $vis:vis $name:ident $storage:ty $(, $comment:literal)? { $($fields:tt)* }) => {
         $(
         #[doc=$comment]
···
         #[repr(transparent)]
         #[derive(Clone, Copy)]
         $vis struct $name($storage);
-
-        impl ::core::ops::BitOr for $name {
-            type Output = Self;
-
-            fn bitor(self, rhs: Self) -> Self::Output {
-                Self(self.0 | rhs.0)
-            }
-        }
 
         impl ::core::convert::From<$name> for $storage {
             fn from(val: $name) -> $storage {