[nrf fromlist] modules: hostap: Fix memory leak of network

In "connect" all networks are removed and  new network is always added,
but in disconnect the network isn't deleted, so, the memory is
unnecessarily held till next connect. This is not exactly a leak, but if
someone profiles using "kernel heap" then this can be construed as a
leak.

Fix this by removing network during the disconnection (for now "all") so
that the memory can be used by someone else.

Upstream PR: zephyrproject-rtos/zephyr#79739

Signed-off-by: Chaitanya Tata <[email protected]>
(cherry picked from commit a51b71dca9a6f402a2fcc93b5272e5a4b4251a46)

Author: krish2718

modules/hostap/src/supp_api.c

@@ -840,6 +840,10 @@ static int wpas_disconnect_network(const struct device *dev, int cur_mode)
 		wifi_mgmt_raise_disconnect_complete_event(iface, ret);
 	}
 
+	if (!wpa_cli_cmd_v("remove_network all")) {
+		wpa_printf(MSG_ERROR, "Failed to remove all networks");
+	}
+
 	return ret;
 }