[ARM] MV78xx0: Support for Buffalo WXL (Terastation Duo)

* Modification of Kconfig to add the Option
* 1 new file : buffalo-wxl-setup.c
This file is inspired from the db-78xx0-setup.c already present.
The following is done:
  - Configure MPP Lines for the plateform (see my patch for MPP)
This is taken from the stock kernel provided by buffalotech (the vendor)
  - GigaBit Ethernet
  - Sata
  - Uart are initiallized in a different way than on the dev board as we
have one core only.
  - USB

The kernel has been running for some days now on my plateform.

Signed-off-by: Sebastien Requiem <sebastien@kolios.dk>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
diff --git a/arch/arm/mach-mv78xx0/Kconfig b/arch/arm/mach-mv78xx0/Kconfig
index 6fbe68f..f2d309d 100644
--- a/arch/arm/mach-mv78xx0/Kconfig
+++ b/arch/arm/mach-mv78xx0/Kconfig
@@ -14,6 +14,12 @@
 	  Say 'Y' here if you want your kernel to support the
 	  Marvell RD-78x00-mASA Reference Design.
 
+config MACH_TERASTATION_WXL
+	bool "Buffalo WLX (Terastation Duo) NAS"
+	help
+	  Say 'Y' here if you want your kernel to support the
+	  Buffalo WXL Nas.
+
 endmenu
 
 endif