package/systemd: Default yes for networkd

It seems logical to enable a few options along with systemd when it's
the init system.

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/systemd/Config.in

@@ -277,6 +277,7 @@ config BR2_PACKAGE_SYSTEMD_POLKIT
 
 config BR2_PACKAGE_SYSTEMD_NETWORKD
 	bool "enable network manager"
+	default y
 	help
 	  systemd-networkd is a system service that manages networks.
 	  It detects and configures network devices as they appear, as well as