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* Don't dispatch vertices directly to MMIO; queue them up in dma-like buffers
first. This makes things more uniform between AGP and MMIO paths, cleans up
some locking ugliness, and makes the driver look more like other drivers.
* Don't use the AGP Cmd buffer provided by the server. Instead allocate one in
the client, which avoids the need for lots of synchronization stuff.
* Mark some MMIO accesses volatile that should have been.
* Disable the AGP submission path by default (agp_disable=true) due to
unresolved issues in the new code. The old code had its own (serious) errors
with AGP, so this is not really a step backwards.
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