arm_kvm: Do not assume particular GIC type in kvm_arch_irqchip_create()

arm_kvm: Do not assume particular GIC type in kvm_arch_irqchip_create()

This allows us to use different GIC types from v2. There are no kernels
which could advertise KVM_CAP_DEVICE_CTRL without the actual ability to
create GIC with it.

GIC version probe code moved to kvm_arm_vgic_probe() which will be used
later.

Signed-off-by: Pavel Fedin <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Tested-by: Ashok kumar <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Message-id: 015f4d9e4a8a50dfbdd734c4730558e24a69c6dc.1441784344[email protected]
Signed-off-by: Peter Maydell <[email protected]>