boards: st: nucleo_wb07cc: add and enable IWDG

Enable IWDG in board DTS and document as available.

Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>
diff --git a/boards/st/nucleo_wb07cc/nucleo_wb07cc.dts b/boards/st/nucleo_wb07cc/nucleo_wb07cc.dts
index 0ac688a..7d9d401 100644
--- a/boards/st/nucleo_wb07cc/nucleo_wb07cc.dts
+++ b/boards/st/nucleo_wb07cc/nucleo_wb07cc.dts
@@ -74,6 +74,7 @@
 		sw0 = &user_button_1;
 		sw1 = &user_button_2;
 		sw2 = &user_button_3;
+		watchdog0 = &iwdg;
 	};
 };
 
@@ -115,6 +116,10 @@
 	status = "okay";
 };
 
+&iwdg {
+	status = "okay";
+};
+
 &bt_hci_wb0 {
 	status = "okay";
 };
diff --git a/boards/st/nucleo_wb07cc/nucleo_wb07cc.yaml b/boards/st/nucleo_wb07cc/nucleo_wb07cc.yaml
index 007f52c..bdd5476 100644
--- a/boards/st/nucleo_wb07cc/nucleo_wb07cc.yaml
+++ b/boards/st/nucleo_wb07cc/nucleo_wb07cc.yaml
@@ -18,5 +18,6 @@
   - pwm
   - rtc
   - spi
+  - watchdog
   - bluetooth
 vendor: st