NFS: Fix attribute delegation behaviour on exclusive create

When the client does an exclusive create and the server decides to store
the verifier in the timestamps, a SETATTR is subsequently sent to fix up
those timestamps. When that is the case, suppress the exceptions for
attribute delegations in nfs4_bitmap_copy_adjust().

Fixes: 32215c1f ("NFSv4: Don't request atime/mtime/size if they are delegated to us")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>