xfs: Add XFS_SB_FEAT_INCOMPAT_NREXT64 to the list of supported flags

xfs: Add XFS_SB_FEAT_INCOMPAT_NREXT64 to the list of supported flags

Source kernel commit: 973ac0eb3a7dfedecd385bd2b48b12e62a0492f2

This commit enables XFS module to work with fs instances having 64-bit
per-inode extent counters by adding XFS_SB_FEAT_INCOMPAT_NREXT64 flag to the
list of supported incompat feature flags.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>