Define CpuidPolicyList as a string so that libxl_cpuid_parse_config can
be used in the toC function.
For now, fromC is a no-op since libxl does not support a way to read a
policy, modify it,and then give it back to libxl.
Signed-off-by: Nick Rosbrook <rosbrookn@ainfosec.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>