ARM: renesas: Add R8A77990 E3 SoC ID

Add ID and Kconfig entry for the Renesas R8A77990 E3 SoC.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/arch/arm/mach-rmobile/Kconfig.64 b/arch/arm/mach-rmobile/Kconfig.64
index 6112d79..6b93d25 100644
--- a/arch/arm/mach-rmobile/Kconfig.64
+++ b/arch/arm/mach-rmobile/Kconfig.64
@@ -12,6 +12,9 @@
 config R8A77970
 	bool "Renesas SoC R8A77970"
 
+config R8A77990
+	bool "Renesas SoC R8A77990"
+
 config R8A77995
 	bool "Renesas SoC R8A77995"