i#1569 AArch64: Replace ARM with AARCHXX in drsyms-test.templatex.
i#1569 AArch64: Replace ARM with AARCHXX in drsyms-test.templatex.

Review-URL: https://codereview.appspot.com/301260043

AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio