Re-enable jdk_jmx for openj9 (#5786)

resolves: eclipse-openj9/openj9#20587 

Signed-off-by: Lan Xia <[email protected]>

Author: llxia

openjdk/playlist.xml

@@ -1620,10 +1620,6 @@
 	<test>
 		<testCaseName>jdk_jmx</testCaseName>
 		<disables>
-			<disable>
-				<comment>https://github.com/eclipse-openj9/openj9/issues/10757</comment>
-				<impl>openj9</impl>
-			</disable>
 			<disable>
 				<comment>https://github.com/eclipse-openj9/openj9/issues/10757</comment>
 				<impl>ibm</impl>