plat/arm: Move board_css_common.c to juno folder

This file is only used by Juno as all other CSS platforms have their own
private memory maps.

Change-Id: I1c9f27aac7b1d8bff4d92674e8bde5505b93c8c4
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

plat/arm/board/common/board_css.mk

-#
-# Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
-#
-# SPDX-License-Identifier: BSD-3-Clause
-#
-
-PLAT_BL_COMMON_SOURCES	+=	plat/arm/board/common/board_css_common.c
-
-include plat/arm/board/common/board_common.mk

plat/arm/board/juno/platform.mk

@@ -29,7 +29,8 @@ CSS_USE_SCMI_SDS_DRIVER		:=	1
 PLAT_INCLUDES		:=	-Iplat/arm/board/juno/include		\
 				-Iplat/arm/css/drivers/sds
 
-PLAT_BL_COMMON_SOURCES	:=	plat/arm/board/juno/${ARCH}/juno_helpers.S
+PLAT_BL_COMMON_SOURCES	:=	plat/arm/board/juno/${ARCH}/juno_helpers.S \
+				plat/arm/board/juno/juno_common.c
 
 # Flag to enable support for AArch32 state on JUNO
 JUNO_AARCH32_EL3_RUNTIME	:=	0
@@ -118,7 +119,7 @@ SKIP_A57_L1_FLUSH_PWR_DWN	:=	 1
 # Do not enable SVE
 ENABLE_SVE_FOR_NS		:=	0
 
-include plat/arm/board/common/board_css.mk
+include plat/arm/board/common/board_common.mk
 include plat/arm/common/arm_common.mk
 include plat/arm/soc/common/soc_css.mk
 include plat/arm/css/common/css_common.mk