Add back the missing setKeymap method

comar/models/Xorg.Display.xml

@@ -53,6 +53,10 @@
         <method name="getPendingConfig" access_label="get">
             <arg name="result" type="a{ss}" direction="out"/>
         </method>
+        <method name="setKeymap" access_label="set">
+            <arg name="layout" type="s" direction="in"/>
+            <arg name="variant" type="s" direction="in"/>
+        </method>
     </interface>
     <interface name="Xorg.Driver">
         <method name="enable"/>