arm64: KVM: split GICv2 world switch from hyp code

Move the GICv2 world switch code into its own file, and add the
necessary indirection to the arm64 switch code.

Also introduce a new type field to the vgic_params structure.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --cc arch/arm/include/asm/kvm_host.h
Simple merge

diff --cc arch/arm64/include/asm/kvm_asm.h
Simple merge

diff --cc arch/arm64/include/asm/kvm_host.h
Simple merge

diff --cc arch/arm64/kernel/asm-offsets.c
Simple merge

diff --cc arch/arm64/kvm/Makefile
Simple merge

diff --cc arch/arm64/kvm/hyp.S
Simple merge

diff --cc arch/arm64/kvm/vgic-v2-switch.S
Simple merge

diff --cc include/kvm/arm_vgic.h
Simple merge

diff --cc virt/kvm/arm/vgic-v2.c
Simple merge

diff --cc virt/kvm/arm/vgic.c
Simple merge