nrf/wdt: add handle steal

embassy-nrf/src/wdt.rs

@@ -150,4 +150,12 @@ impl WatchdogHandle {
         let idx = self.index as usize;
         ((rd >> idx) & 0x1) == 0
     }
+
+    /// Steal a watchdog handle by index.
+    ///
+    /// Safety: watchdog must be initialized, index must be between 0 and N-1 where
+    /// N is the handle count when initializing.
+    pub unsafe fn steal(index: u8) -> Self {
+        Self { index }
+    }
 }