ARM: rmobile: Make the Gen3 SoC configurable

Allow selecting the Gen3 SoC in preparation for RCar M3 .
No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/mach-rmobile/Kconfig.64 b/arch/arm/mach-rmobile/Kconfig.64
index f748c33..e0c27ed 100644
--- a/arch/arm/mach-rmobile/Kconfig.64
+++ b/arch/arm/mach-rmobile/Kconfig.64
@@ -1,7 +1,12 @@
 if RCAR_GEN3
 
+choice
+	prompt "Select Target SoC"
+
 config R8A7795
-	bool
+	bool "Renesas SoC R8A7795"
+
+endchoice
 
 choice
 	prompt "Renesus ARM64 SoCs board select"