idpf: add Tx timestamp capabilities negotiation

Tx timestamp capabilities are negotiated for the uplink Vport.
Driver receives information about the number of available Tx timestamp
latches, the size of Tx timestamp value and the set of indexes used
for Tx timestamping.

Add function to get the Tx timestamp capabilities and parse the uplink
vport flag.

Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Co-developed-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Co-developed-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Milena Olech <milena.olech@intel.com>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>