rust: Fix cargo clippy and cargo doc findings

Fix the new `cargo clippy` and `cargo doc` findings that were triggered
with the recent policy addition.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

rust/pvattest/src/cli.rs

@@ -122,6 +122,7 @@ pub struct PerformAttOpt {
 }
 
 #[cfg(target_arch = "s390x")]
+#[derive(Debug)]
 pub struct PerformAttOptComb<'a> {
     pub input: &'a str,
     pub output: &'a str,

rust/pvattest/src/cmd/verify.rs

@@ -50,7 +50,7 @@ impl<'a> VerifyOutput<'a> {
     }
 }
 
-impl<'a> Display for VerifyOutput<'a> {
+impl Display for VerifyOutput<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         writeln!(f, "Config UID:")?;
         writeln!(f, "{:#}", self.cuid)?;

rust/pvattest/src/main.rs

@@ -16,7 +16,7 @@ use utils::{print_cli_error, print_error, print_version, PvLogger};
 use crate::cmd::*;
 
 static LOGGER: PvLogger = PvLogger;
-const FEATURES: &[&[&str]] = &[cmd::CMD_FN, cmd::UV_CMD_FN];
+const FEATURES: &[&[&str]] = &[CMD_FN, UV_CMD_FN];
 const EXIT_CODE_ATTESTATION_FAIL: u8 = 2;
 const EXIT_CODE_LOGGER_FAIL: u8 = 3;