This issue was resolved by completely killing all the JVM that is running from the same version and path of java and starting them back. (In our case an AIX JVM pConsole was running behind even after putting Dmgr,Node & CL down. Both pConsole and WAS uses the same java)
That was the reason that the updated shared native libraries didn't reflect in the WAS. But after killing&starting back each instance of java, including the ones apart from WAS the native libraries got reflected in the logs .
Sorry about updating the answer after so long.