Reland "Add GkiInstallTest to presubmit."

This reverts commit b99f35ee37827560d9a5f494e00d635d7a8dbba6.

Reason of revert: relanding change now that the test is stable.

Test: TH
Bug: 174126387
Change-Id: I02c517fa6b71c37e1f50ff904b019c4fb0ddc3f3
diff --git a/TEST_MAPPING b/TEST_MAPPING
index b3fe1e6..e3e017d 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -6,6 +6,9 @@
     {
       "name": "libkver_test",
       "host": true
+    },
+    {
+      "name": "GkiInstallTest"
     }
   ]
 }