Add ftl_last to PointerControllerInterface::Presentation

This way it can be printed using ftl::enum_string.

Bug: 254277939
Test: manual
Change-Id: Ie50e4a68073765af24718e84840dce7b03a18c8e
diff --git a/services/inputflinger/include/PointerControllerInterface.h b/services/inputflinger/include/PointerControllerInterface.h
index 647e10c..7e0c1c7 100644
--- a/services/inputflinger/include/PointerControllerInterface.h
+++ b/services/inputflinger/include/PointerControllerInterface.h
@@ -79,6 +79,8 @@
         POINTER,
         // Show spots and a spot anchor in place of the mouse pointer.
         SPOT,
+
+        ftl_last = SPOT,
     };
 
     /* Sets the mode of the pointer controller. */