Add CtsInputRootTestCases to inputflinger postsubmit

Add newly created root CTS tests for input to postsubmit test. They
will be added to presubmit when SLO requirement is met in postsubmit.

Bug: 319611243
Test: presubmit
FLAG: TEST_ONLY
Change-Id: I0e338afb209168f09362c8ee2b31019ef6daab6e
diff --git a/services/inputflinger/TEST_MAPPING b/services/inputflinger/TEST_MAPPING
index 018de5d..af9d2eb 100644
--- a/services/inputflinger/TEST_MAPPING
+++ b/services/inputflinger/TEST_MAPPING
@@ -293,6 +293,9 @@
     },
     {
       "name": "monkey_test"
+    },
+    {
+      "name": "CtsInputRootTestCases"
     }
   ],
   "staged-platinum-postsubmit": [