dma-buf: Expand reservation_list to fill allocation

Since kmalloc() will round up the allocation to the next slab size or
page, it will normally return a pointer to a memory block bigger than we
asked for. We can query for the actual size of the allocated block using
ksize() and expand our variable size reservation_list to take advantage
of that extra space.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Christian König <[email protected]>
Cc: Michel Dänzer <[email protected]>
Reviewed-by: Michel Dänzer <[email protected]>
Reviewed-by: Christian König <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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