plat: renesas: aarch64: Move to common

Move plat aarch64 code to common directory, so that the same
code can be re-used by both R-Car Gen3 and RZ/G2 platforms.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Change-Id: I66265e5e68bfcf5c3534965fb3549a145c782b47
diff --git a/plat/renesas/rcar/platform.mk b/plat/renesas/rcar/platform.mk
index a861c7c..ee393f2 100644
--- a/plat/renesas/rcar/platform.mk
+++ b/plat/renesas/rcar/platform.mk
@@ -312,9 +312,7 @@
 			-Idrivers/renesas/common/pwrc		\
 			-Idrivers/renesas/common/io
 
-BL2_SOURCES	+=	plat/renesas/rcar/aarch64/platform_common.c	\
-			plat/renesas/rcar/aarch64/plat_helpers.S	\
-			plat/renesas/rcar/bl2_interrupt_error.c		\
+BL2_SOURCES	+=	plat/renesas/rcar/bl2_interrupt_error.c		\
 			plat/renesas/rcar/bl2_secure_setting.c		\
 			plat/renesas/rcar/bl2_plat_setup.c		\
 			plat/renesas/rcar/plat_storage.c		\
@@ -324,8 +322,6 @@
 			drivers/renesas/rcar/board/board.c
 
 BL31_SOURCES	+=	plat/renesas/rcar/plat_topology.c		\
-			plat/renesas/rcar/aarch64/plat_helpers.S	\
-			plat/renesas/rcar/aarch64/platform_common.c	\
 			plat/renesas/rcar/bl31_plat_setup.c		\
 			plat/renesas/rcar/plat_pm.c