watchdog: tango: rename ARCH_TANGOX to ARCH_TANGO

This change was requested by arm-soc maintainer Kevin Hilman
because the X in TANGOX is a wildcard.
Signed-off-by: NMarc Gonzalez <marc_gonzalez@sigmadesigns.com>
Acked-by: NMans Rullgard <mans@mansr.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

drivers/watchdog/Kconfig

@@ -145,7 +145,7 @@ config MENF21BMC_WATCHDOG
 config TANGOX_WATCHDOG
 	tristate "Sigma Designs SMP86xx/SMP87xx watchdog"
 	select WATCHDOG_CORE
-	depends on ARCH_TANGOX || COMPILE_TEST
+	depends on ARCH_TANGO || COMPILE_TEST
 	help
 	  Support for the watchdog in Sigma Designs SMP86xx (tango3)
 	  and SMP87xx (tango4) family chips.