fs/smb/client: cifs_prime_dcache() for SMB3 POSIX reparse points

commit 8cb0bc54 upstream.

Spares an extra revalidation request

Cc: stable@vger.kernel.org
Acked-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>