gve: Alloc and free QPLs with the rings

Every tx and rx ring has its own queue-page-list (QPL) that serves as
the bounce buffer. Previously we were allocating QPLs for all queues
before the queues themselves were allocated and later associating a QPL
with a queue. This is avoidable complexity: it is much more natural for
each queue to allocate and free its own QPL.

Moreover, the advent of new queue-manipulating ndo hooks make it hard to
keep things as is: we would need to transfer a QPL from an old queue to
a new queue, and that is unpleasant.

Tested-by: Mina Almasry <[email protected]>
Reviewed-by: Praveen Kaligineedi <[email protected]>
Reviewed-by: Harshitha Ramamurthy <[email protected]>
Signed-off-by: Shailend Chand <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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