rust: i2c: replace kernel::c_str! with C-Strings

C-String literals were added in Rust 1.77. Replace instances of
`kernel::c_str!` with C-String literals where possible.

Signed-off-by: Tamir Duberstein <tamird@gmail.com>
Acked-by: Igor Korotin <igor.korotin.linux@gmail.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://patch.msgid.link/20251222-cstr-i2c-v1-1-df1c258d4615@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: tamird

rust/kernel/i2c.rs

@@ -253,7 +253,7 @@ macro_rules! module_i2c_driver {
 /// # Example
 ///
 ///```
-/// # use kernel::{acpi, bindings, c_str, device::Core, i2c, of};
+/// # use kernel::{acpi, bindings, device::Core, i2c, of};
 ///
 /// struct MyDriver;
 ///
@@ -262,7 +262,7 @@ macro_rules! module_i2c_driver {
 ///     MODULE_ACPI_TABLE,
 ///     <MyDriver as i2c::Driver>::IdInfo,
 ///     [
-///         (acpi::DeviceId::new(c_str!("LNUXBEEF")), ())
+///         (acpi::DeviceId::new(c"LNUXBEEF"), ())
 ///     ]
 /// );
 ///
@@ -271,7 +271,7 @@ macro_rules! module_i2c_driver {
 ///     MODULE_I2C_TABLE,
 ///     <MyDriver as i2c::Driver>::IdInfo,
 ///     [
-///          (i2c::DeviceId::new(c_str!("rust_driver_i2c")), ())
+///          (i2c::DeviceId::new(c"rust_driver_i2c"), ())
 ///     ]
 /// );
 ///
@@ -280,7 +280,7 @@ macro_rules! module_i2c_driver {
 ///     MODULE_OF_TABLE,
 ///     <MyDriver as i2c::Driver>::IdInfo,
 ///     [
-///         (of::DeviceId::new(c_str!("test,device")), ())
+///         (of::DeviceId::new(c"test,device"), ())
 ///     ]
 /// );
 ///