membarrier_function() for clearing cache in L3 is optional and good to have. Currently we log it as error if it is not available, which caused some confusion for CE CDM L3 partners building their own L3. Also corrected a typo in the function name. Test: build L3 and run dynamic level3 tests Change-Id: If20bcb1fe2bace33c43aa178af699f3b190a1fd2