Bug #9604: Fix a static buffer allocation failure.

Bug #9604: Fix a static buffer allocation failure.

The pool that the static buffer got allocated from was sized by pitch * height,
but the buffer generated from it had its size aligned to a tile boundary, so
allocation failed if pitch * height wasn't aligned.  However, the 2d driver
ensures that the size ends at a tile boundary, so just pass the 2d driver's
buffer size rather than calculating it.