clean riscv-peripheral tests

Author: romancardenas

riscv-pac/macros/src/lib.rs

@@ -39,7 +39,6 @@ impl PacNumberEnum {
                 },
                 _ => panic!("Variant must have a discriminant"),
             };
-            // check for duplicate discriminant values
             var_map.insert(value, ident);
             numbers.push(value);
         }

riscv-peripheral/src/plic.rs

@@ -158,6 +158,8 @@ pub(crate) mod test {
         I4 = 4,
     }
 
+    unsafe impl ExternalInterruptNumber for Interrupt {}
+
     #[pac_enum(unsafe PriorityNumber)]
     #[derive(Clone, Copy, Debug, Eq, PartialEq)]
     #[repr(u8)]