panfrost: Move BO cache related fields to a sub-struct

We will soon introduce an LRU list to evict BOs that have been unused
for more than 1 second. Let's first move all BO cache fields to a
sub-struct to clarify which fields are used by the BO caching logic.

Signed-off-by: Boris Brezillon <[email protected]>
Reviewed-by: Alyssa Rosenzweig <[email protected]>

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