intel: aubinator: drop the 1Tb GTT mapping

Now that we're softpinning the address of our BOs in anv & i965, the
addresses selected start at the top of the addressing space. This is a
problem for the current implementation of aubinator which uses only a
40bit mmapped address space.

This change keeps track of all the memory writes from the aub file and
fetch them on request by the batch decoder. As a result we can get rid
of the 1<<40 mmapped address space and only rely on the mmap aub file
\o/

Signed-off-by: Lionel Landwerlin <[email protected]>
Reviewed-by: Rafael Antognolli <[email protected]>

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