[RHEL/6] audit_rules_kernel_module_loading rule:
* Enhance OVAL check to (besides plain 'x') to allow also stronger
  mask (e.g. 'rax'),
* Add RHEL-6 remediation

  Note: It's intentional here for each architecture to check just for
  presence of audit rule specific for that architecture (IOW 32-bit
  version on 32-bit arch, 64-bit version on 64-bit archs, since 32-bit
  kernel object can't be loaded / unloaded into kernel compiled as
  64-bit).