ethtool: RX software timestamp for all

All devices support SOF_TIMESTAMPING_RX_SOFTWARE by virtue of
net_timestamp_check() being called in the device independent code.

Move the responsibility of reporting SOF_TIMESTAMPING_RX_SOFTWARE and
SOF_TIMESTAMPING_SOFTWARE, and setting PHC index to -1 to the core.
Device drivers no longer need to use them.

Suggested-by: Willem de Bruijn <[email protected]>
Link: https://lore.kernel.org/netdev/[email protected]/
Co-developed-by: Rahul Rameshbabu <[email protected]>
Signed-off-by: Rahul Rameshbabu <[email protected]>
Signed-off-by: Gal Pressman <[email protected]>
Reviewed-by: Marc Kleine-Budde <[email protected]>
Reviewed-by: Willem de Bruijn <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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