TF-A GICv3 driver: Separate GICD and GICR accessor functions

This patch provides separation of GICD, GICR accessor
functions and adds new macros for GICv3 registers access
as a preparation for GICv3.1 and GICv4 support.
NOTE: Platforms need to modify to include both
'gicdv3_helpers.c' and 'gicrv3_helpers.c' instead of the
single helper file previously.

Change-Id: I1641bd6d217d6eb7d1228be3c4177b2d556da60a
Signed-off-by: Alexei Fedorov <Alexei.Fedorov@arm.com>
diff --git a/include/drivers/arm/gicv3.h b/include/drivers/arm/gicv3.h
index c4f42d0..e6339bc 100644
--- a/include/drivers/arm/gicv3.h
+++ b/include/drivers/arm/gicv3.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -32,7 +32,7 @@
 #define GICD_SETSPI_NSR		U(0x40)
 #define GICD_CLRSPI_NSR		U(0x48)
 #define GICD_SETSPI_SR		U(0x50)
-#define GICD_CLRSPI_SR		U(0x50)
+#define GICD_CLRSPI_SR		U(0x58)
 #define GICD_IGRPMODR		U(0xd00)
 /*
  * GICD_IROUTER<n> register is at 0x6000 + 8n, where n is the interrupt id and
@@ -79,7 +79,7 @@
 #define NUM_OF_DIST_REGS	30
 
 /*******************************************************************************
- * GICv3 Re-distributor interface registers & constants
+ * GICv3 Redistributor interface registers & constants
  ******************************************************************************/
 #define GICR_PCPUBASE_SHIFT	0x11
 #define GICR_SGIBASE_OFFSET	U(65536)	/* 64 KB */