boot/init: Mark udev as required for graphics

With modular kernels, it may be that kernel modules need to be loaded
"automatically" by udev for things to work correctly, like input.

boot/init/tasks/udev.rb

@@ -11,6 +11,9 @@ class Tasks::UDev < SingletonTask
     # It is preferred to depend on the specific device rather than this target.
     Targets[:Devices].add_dependency(:Task, self)
     Targets[:SwitchRoot].add_dependency(:Task, self)
+
+    # May be required for input
+    Targets[:Graphics].add_dependency(:Task, self)
   end
 
   def udevadm(*args)