EVM: turn evm_config_xattrnames into a list

Use a list of xattrs rather than an array - this makes it easier to
extend the list at runtime.

Signed-off-by: Matthew Garrett <mjg59@google.com>
Reviewed-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>