flashrom_tester: Fix cargo check and clippy warnings

Change-Id: I50c5af61e06df1bb6956f347cb6806a7eca6ce0e
Signed-off-by: Evan Benn <evanbenn@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/67472
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/flashrom_tester/src/cros_sysinfo.rs

@@ -34,7 +34,6 @@
 //
 
 use std::ffi::OsStr;
-use std::fmt::Debug;
 use std::io::Result as IoResult;
 use std::process::{Command, Stdio};