sh: Add RSK2+SH7264 board

The RSK2+SH7264 board uses the sh7264 processor. It is often
referred to as just rsk7264. NOR Flash, SDRAM, serial, USB Host and
ethernet are working.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/boards/mach-rsk/Kconfig b/arch/sh/boards/mach-rsk/Kconfig
index aeff3b0..4abbdee 100644
--- a/arch/sh/boards/mach-rsk/Kconfig
+++ b/arch/sh/boards/mach-rsk/Kconfig
@@ -13,6 +13,10 @@
 	select ARCH_REQUIRE_GPIOLIB
 	depends on CPU_SUBTYPE_SH7203
 
+config SH_RSK7264
+	bool "RSK2+SH7264"
+	depends on CPU_SUBTYPE_SH7264
+
 endchoice
 
 endif