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

man/man5/zpool-features.5

@@ -313,6 +313,8 @@ ever had their checksum set to \fBedonr\fR are destroyed.
 
 The \fBedonr\fR feature is not supported by GRUB and must not be used on
 the pool if GRUB needs to access the pool (e.g. for /boot).
+
+FreeBSD does not support the \fBedonr\fR feature.
 .RE
 
 .sp

man/man8/zfsprops.8

@@ -705,6 +705,9 @@ and
 checksum algorithms require enabling the appropriate features on the pool.
 These pool features are not supported by GRUB and must not be used on the
 pool if GRUB needs to access the pool (e.g. for /boot).
+FreeBSD does not support the
+.Sy edonr
+algorithm.
 .Pp
 Please see
 .Xr zpool-features 5