refactor(gic): move GIC IIDR numbers

For the GIC power management we need to identify certain GIC
implementations, so we have the IIDR values for some Arm Ltd. GIC models
defined.
We will need those number elsewhere very soon, so export them to a
shared header file, to avoid defining them again.

Change-Id: I1b8e2d93d6cea0d066866143c89eef736231134f
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/drivers/arm/gic/v3/gic-x00.c b/drivers/arm/gic/v3/gic-x00.c
index eccfd97..aaef485 100644
--- a/drivers/arm/gic/v3/gic-x00.c
+++ b/drivers/arm/gic/v3/gic-x00.c
@@ -16,15 +16,13 @@
 #include <assert.h>
 
 #include <arch_helpers.h>
+#include <drivers/arm/arm_gicv3_common.h>
 #include <drivers/arm/gicv3.h>
 
 #include "gicv3_private.h"
 
 /* GIC-600 specific register offsets */
 #define GICR_PWRR			0x24U
-#define IIDR_MODEL_ARM_GIC_600		U(0x0200043b)
-#define IIDR_MODEL_ARM_GIC_600AE	U(0x0300043b)
-#define IIDR_MODEL_ARM_GIC_700		U(0x0400043b)
 
 /* GICR_PWRR fields */
 #define PWRR_RDPD_SHIFT			0