[Nouveau] [PATCH] Fix glTexSubImage on swizzled surfaces on <=NV40

[Luca Barbieri]

Third attempt, as the second one was logically wrong.
The problem in the first patch was actually that the source point
register has a 1024 limit.
This one leaves the way the source is set up alone, and sets the whole
surface as the destination like in the first version, using the point
registers (which do not seem to have a 1024 limit, but only on the
destination).

Needs testing on <NV40.
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