gve: split up notify block allocation and setup paths

Before this patch, notify block allocation and setup occurred in the same
method. This all occurred before gve_adminq_configure_device_resources,
which populates the irq_db_indicies array, a DMA region with BAR offsets
for MSI-X vectors.

The coming mailbox mode will require notify blocks to be set up only
after receiving the IRQ doorbell offsets, as the request does not work
with a supplied DMA buffer in the way that admin queue mode does. The
intended flow in that case would be:

1) allocate notify blocks
2) request doorbell information
3) set up MSI-X vectors based on doorbell info

This ordering also works for admin queue mode, so it will be updated to
match.

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/20260930190428.1130007-9-hramamurthy@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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