arm64: renesas: Deduplicate R-Car Gen3 and Gen4 SPL

Move R-Car Gen3 and Gen4 jump_to_image_no_args() into dedicated
rcar64-spl.c file. The implementation of jump_to_image_no_args()
is identical. No functional change.

Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/board/renesas/common/Makefile b/board/renesas/common/Makefile
index 8c26c0a..347be5c 100644
--- a/board/renesas/common/Makefile
+++ b/board/renesas/common/Makefile
@@ -17,7 +17,9 @@
 
 # 64 bit SoCs
 ifdef CONFIG_RCAR_64
-ifndef CONFIG_XPL_BUILD
+ifdef CONFIG_XPL_BUILD
+obj-y	+= rcar64-spl.o
+else
 obj-y	+= rcar64-common.o
 endif