[PATCH] zfs: recognize zpools formatted with features support as used in OpenZFS

Currently no features are implemented, only the zpool version 5000 that indicating the features support, is recognized. Since it is possible for OpenZFS to create a pool with features support enabled, but without enabling any actual feature, this change enables U-Boot to read such pools.

Signed-off-by: WHR msl0000023508@gmail.com