package/systemd: needs sulogin for emergency target support

systemd invokes util-linux' sulogin via systemd-sulogin-shell[1] via
emergency.service/emergency.target[2].

[1] https://github.com/systemd/systemd/blob/main/src/sulogin-shell/sulogin-shell.c
[2] https://github.com/systemd/systemd/blob/main/units/emergency.service.in#L23

Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
[yann.morin.1998@free.fr: drop superfluous dependency comment]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 613c817aefbaf5f62bf75437da61752a30348e8b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/systemd/Config.in

@@ -34,6 +34,7 @@ menuconfig BR2_PACKAGE_SYSTEMD
 	select BR2_PACKAGE_UTIL_LINUX_AGETTY
 	select BR2_PACKAGE_UTIL_LINUX_MOUNT
 	select BR2_PACKAGE_UTIL_LINUX_FSCK
+	select BR2_PACKAGE_UTIL_LINUX_SULOGIN
 	select BR2_PACKAGE_KMOD
 	select BR2_PACKAGE_BUSYBOX_SHOW_OTHERS # kmod-tools
 	select BR2_PACKAGE_KMOD_TOOLS