Disable EDONR on FreeBSD

FreeBSD uses its own crypto framework in-kernel which, at this time,
has no EDONR implementation.

Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Allan Jude <allanjude@freebsd.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Signed-off-by: Ryan Moeller <ryan@ixsystems.com>
Closes #9664

include/sys/zio.h

@@ -85,7 +85,9 @@ enum zio_checksum {
 	ZIO_CHECKSUM_NOPARITY,
 	ZIO_CHECKSUM_SHA512,
 	ZIO_CHECKSUM_SKEIN,
+#if !defined(__FreeBSD__)
 	ZIO_CHECKSUM_EDONR,
+#endif
 	ZIO_CHECKSUM_FUNCTIONS
 };