xen: Remove Xen PVH/PVHVM dependency on PCI
A Xen PVH domain doesn't have a PCI bus or devices, so it doesn't need
PCI support built in. Currently, XEN_PVH depends on XEN_PVHVM which
depends on PCI.
Introduce XEN_PVHVM_GUEST as a toplevel item and change XEN_PVHVM to a
hidden variable. This allows XEN_PVH to depend on XEN_PVHVM without PCI
while XEN_PVHVM_GUEST depends on PCI.
In drivers/xen, compile platform-pci depending on XEN_PVHVM_GUEST since
that pulls in the PCI dependency for linking.
Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20201014175342.152712-2-jandryuk@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
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