uefi: Fix Status ERROR_BIT

Set the highest bit for a usize instead of hardcoding bit 63. Fixes
compilation on i686-unknown-uefi.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

Author: crawfxrd

crates/uefi/src/status.rs

@@ -1,6 +1,6 @@
 use core::ops::{ControlFlow, FromResidual, Try};
 
-pub const ERROR_BIT: usize = 1 << 63;
+pub const ERROR_BIT: usize = 1 << (usize::BITS - 1);
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
 #[repr(usize)]