pciaccess clean up

[Ian Romanick]

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Tiago Vignatti wrote:

| In Xorg without pciaccess the scheme to enable the resources of a given
| card on server initialization is as follows:
|
|     1. Disable all pci accesses: the bus and pci devices
|
|     2. Enable current VGA card access:
|        xf86EnableAccess() -> pciSetBusAccess()
|        xf86EnableAccess() -> pciIo_MemAccessEnable()
|
|     3. PreInit() phase: if the card is not yet the one which is routing
|        the informations, initialize it through int10:
|        xf86ExecX86int10()
|
|     4. xf86PostScreenInit() phase:
|        xf86EnterServerState() -> setAccess() -> pciMemAccessEnable()
|
|
| while in the pciaccess Xorg, only the step 2 is performed. So strange.

This is by design.  In the pre-PCI-rework discussions we decided that it
was pure evil for the X server to muck about with PCI device / bus
enables.  I thought that the int10 boot-strap was still enabled, though.

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