Add did_wake to shell implementation

Author: Janrupf

src/sys/shell/waker.rs

@@ -13,4 +13,8 @@ impl Waker {
     pub fn wake(&self) -> io::Result<()> {
         os_required!();
     }
+
+    pub fn did_wake(&self) {
+        os_required!();
+    }
 }