refactor: convert arm platforms to use the generic GIC driver

This reduces the code the platforms have to carry and makes their build
rules a bit simpler.

The main benefit is that plat_my_core_pos() no longer needs to be called
within the driver, helping with performance a bit.

Change-Id: I0b0d1d36d20d67c41c8c9dc14ade11bda6d4a6af
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
diff --git a/plat/arm/board/juno/platform.mk b/plat/arm/board/juno/platform.mk
index e6f271a..38ba0ed 100644
--- a/plat/arm/board/juno/platform.mk
+++ b/plat/arm/board/juno/platform.mk
@@ -1,17 +1,12 @@
 #
-# Copyright (c) 2013-2024, Arm Limited and Contributors. All rights reserved.
+# Copyright (c) 2013-2025, Arm Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
 include common/fdt_wrappers.mk
 
-# Include GICv2 driver files
-include drivers/arm/gic/v2/gicv2.mk
-
-JUNO_GIC_SOURCES	:=	${GICV2_SOURCES}			\
-				plat/common/plat_gicv2.c		\
-				plat/common/plat_gicv2_base.c
+USE_GIC_DRIVER		:=	2
 
 JUNO_INTERCONNECT_SOURCES	:=	drivers/arm/cci/cci.c		\
 					plat/arm/common/arm_cci.c
@@ -99,7 +94,6 @@
 				plat/arm/board/juno/juno_pm.c		\
 				plat/arm/board/juno/juno_topology.c	\
 				plat/arm/common/arm_nor_psci_mem_protect.c \
-				${JUNO_GIC_SOURCES}			\
 				${JUNO_INTERCONNECT_SOURCES}		\
 				${JUNO_SECURITY_SOURCES}