[dv/clkmgr] Add clkmgr_frequency test

Signed-off-by: Guillermo Maturana <maturana@google.com>
diff --git a/hw/ip/clkmgr/data/clkmgr_testplan.hjson b/hw/ip/clkmgr/data/clkmgr_testplan.hjson
index 3868431..0eb4c5a 100644
--- a/hw/ip/clkmgr/data/clkmgr_testplan.hjson
+++ b/hw/ip/clkmgr/data/clkmgr_testplan.hjson
@@ -201,7 +201,7 @@
             - Coverage collected per clock.
             '''
       milestone: V2
-      tests: []
+      tests: ["clkmgr_frequency"]
     }
     {
       name: frequency_overflow