ARM: dts: renesas: Add RZ/A1 platform code

Add platform code and DTs for Renesas RZ/A1 R7S72100 SoC.
Distinguishing feature of this SoC is that it has up to
10 MiB of on-SoC static RAM (SRAM).

The DTs are imported from Linux 5.0.11, commit d5a2675b207d .

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Chris Brandt <chris.brandt@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 5be959b..f91c590 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -785,7 +785,7 @@
 
 config ARCH_RMOBILE
 	bool "Renesas ARM SoCs"
-	select BOARD_EARLY_INIT_F
+	select BOARD_EARLY_INIT_F if !RZA1
 	select DM
 	select DM_SERIAL
 	imply CMD_DM