irqchip/gic-v3: Parse and export virtual GIC information

Fill up the recently introduced gic_kvm_info with the hardware
information used for virtualization.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

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

@@ -15,6 +15,7 @@
 
 enum gic_type {
 	GIC_V2,
+	GIC_V3,
 };
 
 struct gic_kvm_info {