gpu: host1x: At first try a non-blocking allocation for the gather copy

The blocking gather copy allocation is a major performance downside of the
Host1x firewall, it may take hundreds milliseconds which is unacceptable
for the real-time graphics operations. Let's try a non-blocking allocation
first as a least invasive solution, it makes opentegra (Xorg driver)
performance indistinguishable with/without the firewall.

Signed-off-by: Dmitry Osipenko <[email protected]>
Reviewed-by: Erik Faye-Lund <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>

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