EXA EnableDisableFBAccess paths.

[Dave Airlie]

I think we have a problem with the EnableDisableFBAccess paths,
but I'm not 100% sure how to fix it. However I don't believe the
swapped out flag should be hit for driver pixmaps at all.

The problem is on VT enter, the wrapped EDFBA function, does an 
if (set_disable) disable, call wrap, if (set_enabled) enable, however inside
the call wrap we get an exposure generation and we end up doing a bunch
of pointless sw rendering when clearly we could avoid it.

But I'm not sure what the logic behind the wrap calling sequence.

I've attached a patch that avoids hitting swapped out flag for driver pixmaps
and this makes fast user switch on radeon/kms actually fast.

Dave.
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