ice: Correctly initialize queue context values

The ice_alloc_lan_q_ctx function allocates the queue context array for a
given traffic class. This function uses devm_kcalloc which will
zero-allocate the structure. Thus, prior to any queue being setup by
ice_ena_vsi_txq, the q_ctx structure will have a q_handle of 0 and a q_teid
of 0. These are potentially valid values.

Modify the ice_alloc_lan_q_ctx function to initialize every member of the
q_ctx array to have invalid values. Modify ice_dis_vsi_txq to ensure that
it assigns q_teid to an invalid value when it assigns q_handle to the
invalid value as well.

This will allow other code to check whether the queue context is currently
valid before operating on it.

Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Daniel Machon <[email protected]>
Signed-off-by: Jacob Keller <[email protected]>
Signed-off-by: Dave Ertman <[email protected]>
Tested-by: Sujai Buvaneswaran <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

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