IB/mlx5: Replace tunnel mpls capability bits for tunnel_offloads

Until now the flex parser capability was used in ib_query_device() to
indicate tunnel_offloads_caps support for mpls_over_gre/mpls_over_udp.

Newer devices and firmware will have configurations with the flexparser
but without mpls support.

Testing for the flex parser capability was a mistake, the tunnel_stateless
capability was intended for detecting mpls and was introduced at the same
time as the flex parser capability.

Otherwise userspace will be incorrectly informed that a future device
supports MPLS when it does not.

Link: https://lore.kernel.org/r/[email protected]
Cc: <[email protected]> # 4.17
Fixes: e818e255a58d ("IB/mlx5: Expose MPLS related tunneling offloads")
Signed-off-by: Alex Vesker <[email protected]>
Reviewed-by: Ariel Levkovich <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

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