ARM: cns3xxx: Add CNS3420 Validation Board support

This patch adds support for CNS3420VB rev 1.3 boards. With this patch
CNS3420VB boards are able to boot up to the userspace, with a console
available on UART0.

Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>
diff --git a/arch/arm/mach-cns3xxx/Kconfig b/arch/arm/mach-cns3xxx/Kconfig
index 20284cd..9ebfcc4 100644
--- a/arch/arm/mach-cns3xxx/Kconfig
+++ b/arch/arm/mach-cns3xxx/Kconfig
@@ -1,4 +1,12 @@
 menu "CNS3XXX platform type"
 	depends on ARCH_CNS3XXX
 
+config MACH_CNS3420VB
+	bool "Support for CNS3420 Validation Board"
+	help
+	  Include support for the Cavium Networks CNS3420 MPCore Platform
+	  Baseboard.
+	  This is a platform with an on-board ARM11 MPCore and has support
+	  for USB, USB-OTG, MMC/SD/SDIO, SATA, PCI-E, etc.
+
 endmenu