eudev: add input group

It's used by 50-default-udev.rules for input-class devices.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/eudev/eudev.mk

@@ -42,4 +42,9 @@ define EUDEV_INSTALL_INIT_SYSV
 	$(INSTALL) -m 0755 package/eudev/S10udev $(TARGET_DIR)/etc/init.d/S10udev
 endef
 
+# Required by default rules for input devices
+define EUDEV_USERS
+	- - input -1 * - - - Input device group
+endef
+
 $(eval $(autotools-package))