dts: Enable AES node in nucleo_l4a6zg.dts

Activate AES node in nucleo_l4a6zg.dts to enable testing of the
st,stm32l4-aes driver in CI.

Signed-off-by: Lucas Dietrich <[email protected]>

Author: lucasdietrich

boards/st/nucleo_l4a6zg/nucleo_l4a6zg.dts

@@ -141,3 +141,7 @@
 &wwdg {
 	status = "okay";
 };
+
+&aes {
+	status = "okay";
+};