arm/arm64: KVM: Consolidate the PSCI include files

arm/arm64: KVM: Consolidate the PSCI include files

commit 1a2fb94e6a77 upstream.

As we're about to update the PSCI support, and because I'm lazy,
let's move the PSCI include file to include/kvm so that both
ARM architectures can find it.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Conflicts:
	need kvm/arm_psci.h in files:
	arch/arm64/kvm/handle_exit.c
	arch/arm/kvm/psci.c and arch/arm/kvm/arm.c
	no virt/kvm/arm/arm.c and virt/kvm/arm/psci.c