ARM: renesas: Factor out DRAM setup on R-Car Gen3

Pull DRAM layout configuration code into rcar-common.c instead of
having it in multiple copies across board files. This poses no
change for Salvator-X/XS, ULCB and Ebisu boards, however it adds
a bit of extra code for Draak and Eagle boards, which now gain
the capability of being passed in the DRAM layout by the ATF.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Eugeniu Rosca <roscaeugeniu@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/renesas/draak/Makefile b/board/renesas/draak/Makefile
index 0140b61..1fc90d1 100644
--- a/board/renesas/draak/Makefile
+++ b/board/renesas/draak/Makefile
@@ -9,5 +9,5 @@
 ifdef CONFIG_SPL_BUILD
 obj-y	:= ../rcar-common/gen3-spl.o
 else
-obj-y	:= draak.o
+obj-y	:= draak.o ../rcar-common/common.o
 endif