gve: introduce new methods to handle IRQ doorbells

Introduce `request_db_info` and `release_db_resources` to
`struct gve_ctrl_ops`. These encapsulate the configuration of device
resources (counter arrays and IRQ doorbell indices) which vary between
Admin Queue and Mailbox modes. All behaviors related to the IRQ doorbell
indices will be managed by these new methods instead of occurring
directly in notify_block setup/teardown methods. Similarly, GQ ring
counters will be managed in `request_db_info`.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Jordan Rhee <jordanrhee@google.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Joshua Washington <joshwash@google.com>
Signed-off-by: Harshitha Ramamurthy <hramamurthy@google.com>
Link: https://patch.msgid.link/20260930190428.1130007-10-hramamurthy@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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