Enable OT OTBN ECDSA test

Match https://github.com/renode/renode/commit/7c10424

Change-Id: Ifef3b072f25979df0ca71c9dcb42d676541d8f69

opentitan_peripherals_test.robot

diff --git a/opentitan_peripherals_test.robot b/opentitan_peripherals_test.robot
index 401a6e6..5476ec6 100644
--- a/opentitan_peripherals_test.robot
+++ b/opentitan_peripherals_test.robot
@@ -239,9 +239,7 @@
 Should Pass SRAM Controller Smoketest
     Run Test               ${SRAM_CTRL_BIN}
 
-# Not fixed yet
 Should Pass OTBN ECDSA Test
-    [Tags]                 skipped
     Prepare Test           ${OTBN_ECDSA_BIN}
     Execute Test