samples: rust: fix endianness issue in rust_driver_pci

MMIO backend of PCI Bar always assumes little-endian devices and
will convert to CPU endianness automatically. Remove the u32::from_le
conversion which would cause a bug on big-endian machines.

Cc: [e-mail]
Reviewed-by: Dirk Behme <[e-mail]>
Signed-off-by: Marko Turk <[e-mail]>
Fixes: 685376d18e9a ("samples: rust: add Rust PCI sample driver")
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Danilo Krummrich <[e-mail]>

samples/rust/rust_driver_pci.rs

···
         // Select the test.
         bar.write8(index.0, Regs::TEST);
 
-        let offset = u32::from_le(bar.read32(Regs::OFFSET)) as usize;
+        let offset = bar.read32(Regs::OFFSET) as usize;
         let data = bar.read8(Regs::DATA);
 
         // Write `data` to `offset` to increase `count` by one.