smb: client: introduce SMB2_OP_QUERY_WSL_EA

[ Upstream commit ea41367b ]

Add a new command to smb2_compound_op() for querying WSL extended
attributes from reparse points.

Signed-off-by: Paulo Alcantara <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>