Make MMU debug output show the address being translated

src/mmu.rs

@@ -182,6 +182,9 @@ impl Mmu for MmuCard {
     ) -> NullableResult<u32, BusError> {
         let print_debug = self.print_debug;
         if self.enabled {
+            if print_debug {
+                println!("Translating {:#x}", address);
+            }
             let page = address >> 12;
             let offset = address & 0xFFF;
             let entry = if let Some(entry) = self.cache[page as usize] {