irqchip/gic-v3: Advertise GICv4 support to KVM

As KVM needs to know about the availability of GICv4 to enable
direct injection of interrupts, let's advertise the feature in
the gic_kvm_info structure.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

include/linux/irqchip/arm-gic-common.h

@@ -27,6 +27,8 @@ struct gic_kvm_info {
 	unsigned int	maint_irq;
 	/* Virtual control interface */
 	struct resource vctrl;
+	/* vlpi support */
+	bool		has_v4;
 };
 
 const struct gic_kvm_info *gic_get_kvm_info(void);