[initcpio] add usr hook as needed

src/modules/initcpiocfg/main.py

@@ -144,6 +144,9 @@ def modify_mkinitcpio_conf(partitions, root_mount_point):
                 and "luksMapperName" not in partition):
             unencrypted_separate_boot = True
 
+        if (partition["mountPoint"] == "/usr"
+            hooks.append("usr")
+
     if encrypt_hook:
         hooks.append("encrypt")
         if not unencrypted_separate_boot and \