[keymgr/dv] Fix asserton typo

wanted to use asserton, but mistakenly used assertoff

Signed-off-by: Weicai Yang <weicai@google.com>
diff --git a/hw/ip/keymgr/dv/env/seq_lib/keymgr_cmd_invalid_vseq.sv b/hw/ip/keymgr/dv/env/seq_lib/keymgr_cmd_invalid_vseq.sv
index dc9de94..c3e47ec 100644
--- a/hw/ip/keymgr/dv/env/seq_lib/keymgr_cmd_invalid_vseq.sv
+++ b/hw/ip/keymgr/dv/env/seq_lib/keymgr_cmd_invalid_vseq.sv
@@ -42,7 +42,7 @@
     do_reset_at_end_of_seq = 1;
     super.post_start();
     cfg.en_scb = 1;
-    $assertoff(1, "tb.keymgr_kmac_intf");
-    $assertoff(1, "tb.dut.tlul_assert_device.gen_device.dDataKnown_A");
+    $asserton(0, "tb.keymgr_kmac_intf");
+    $asserton(0, "tb.dut.tlul_assert_device.gen_device.dDataKnown_A");
   endtask
 endclass : keymgr_cmd_invalid_vseq