ice: Add support for per VF ctrl VSI enabling

We are going to enable FDIR configure for AVF through virtual channel.
The first step is to add helper functions to support control VSI setup.
A control VSI will be allocated for a VF when AVF creates its
first FDIR rule through ice_vf_ctrl_vsi_setup().
The patch will also allocate FDIR rule space for VF's control VSI.
If a VF asks for flow director rules, then those should come entirely
from the best effort pool and not from the guaranteed pool. The patch
allow a VF VSI to have only space in the best effort rules.

Signed-off-by: Xiaoyun Li <[email protected]>
Signed-off-by: Yahui Cao <[email protected]>
Signed-off-by: Qi Zhang <[email protected]>
Tested-by: Chen Bo <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

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