tests/eas/test_env: add feature to allows to disable kernel deployment

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>
diff --git a/target.config b/target.config
index 781005e..ca4563b 100644
--- a/target.config
+++ b/target.config
@@ -35,6 +35,7 @@
     },
 
     /* Test environment features */
+    //  no-kernel : do not deploy kernel/dtb images
     //  no-reboot : do not force reboot the target at each configuration change
     //  debug     : enable debugging messages
     "__features__" : ""