fix(gic600): fix gic600 maximum SPI ID

According to GIC-600 TRM, it supports up to 960 SPIs. With the
starting SPI_ID of 32, the maximum SPI_ID should be 991. This patch
fixes the value of GIC600_SPI_ID_MAX which is currently configured
to be 960.

Signed-off-by: sahil <sahil@arm.com>
Change-Id: I441f9a607d160db8533f2a03e02afd1a9bab991e
diff --git a/drivers/arm/gic/v3/gic600_multichip_private.h b/drivers/arm/gic/v3/gic600_multichip_private.h
index f6028ad..fd1cb57 100644
--- a/drivers/arm/gic/v3/gic600_multichip_private.h
+++ b/drivers/arm/gic/v3/gic600_multichip_private.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2022, ARM Limited. All rights reserved.
+ * Copyright (c) 2019-2023, ARM Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -39,7 +39,7 @@
 
 /* SPI interrupt id minimum and maximum range */
 #define GIC600_SPI_ID_MIN		32
-#define GIC600_SPI_ID_MAX		960
+#define GIC600_SPI_ID_MAX		991
 
 #define GIC700_SPI_ID_MIN		32
 #define GIC700_SPI_ID_MAX		991