KVM: arm/arm64: vgic: make vgic_io_ops static

vgic_io_ops is only referenced within vgic.c, so it can be declared
static.
Signed-off-by: NJisheng Zhang <jszhang@marvell.com>
Signed-off-by: NChristoffer Dall <christoffer.dall@linaro.org>

virt/kvm/arm/vgic.c

@@ -878,7 +878,7 @@ static int vgic_handle_mmio_write(struct kvm_vcpu *vcpu,
 				       true);
 }
 
-struct kvm_io_device_ops vgic_io_ops = {
+static struct kvm_io_device_ops vgic_io_ops = {
 	.read	= vgic_handle_mmio_read,
 	.write	= vgic_handle_mmio_write,
 };