gve: Add RSS adminq commands and ethtool support

gve: Add RSS adminq commands and ethtool support

Introduce adminq commands to configure and retrieve RSS settings from
the device. Implement corresponding ethtool ops for user-level
management.

Signed-off-by: Jeroen de Borst <jeroendb@google.com>
Co-developed-by: Ziwei Xiao <ziweixiao@google.com>
Signed-off-by: Ziwei Xiao <ziweixiao@google.com>
Signed-off-by: Praveen Kaligineedi <pkaligineedi@google.com>
Reviewed-by: Praveen Kaligineedi <pkaligineedi@google.com>
Reviewed-by: Harshitha Ramamurthy <hramamurthy@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Hariprasad Kelam <hkelam@marvell.com>
Link: https://patch.msgid.link/20240812222013.1503584-3-pkaligineedi@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>