[coreboot] v3 bus support patch

[Myles Watson]

This patch introduces {PCIX,PCIE,AGP...}_SUPPORT config variables.

Signed-off-by: Myles Watson <mylesgw at gmail.com>

Thanks,
Myles

Kconfig:
	Add *_SUPPORT variables.
	Add select statements for the hardware that needs them.

device/Makefile:
	Test *_SUPPORT variables instead of chip names.

device/Kconfig:
	Add *_PLUGIN_SUPPORT variables.

device/pci_device.c:
	Conditionally include headers if *_PLUGIN_SUPPORT.
	Update default drivers to depend on CONFIG_*_PLUGIN_SUPPORT.
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