ARM: renesas: Add basic R8A774A1 Support

In order to build boards based on the R8A774A1, there needs to
be a config option from which to enable other drivers and/or flags
for this SoC.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/arch/arm/mach-rmobile/Kconfig.64 b/arch/arm/mach-rmobile/Kconfig.64
index c8f93c6..bfd513a 100644
--- a/arch/arm/mach-rmobile/Kconfig.64
+++ b/arch/arm/mach-rmobile/Kconfig.64
@@ -2,6 +2,9 @@
 
 menu "Select Target SoC"
 
+config R8A774A1
+        bool "Renesas SoC R8A774A1"
+
 config R8A7795
 	bool "Renesas SoC R8A7795"
 	imply CLK_R8A7795