ice: Support HW timestamp hint

Use previously refactored code and create a function
that allows XDP code to read HW timestamp.

Also, introduce packet context, where hints-related data will be stored.
ice_xdp_buff contains only a pointer to this structure, to avoid copying it
in ZC mode later in the series.

HW timestamp is the first supported hint in the driver,
so also add xdp_metadata_ops.

Reviewed-by: Maciej Fijalkowski <[email protected]>
Signed-off-by: Larysa Zaremba <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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