watchdog: iTCO_wdt.c: convert to watchdog core

This patch converts the iTCO_wdt watchdog driver to use the
generic watchdog framework.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index fe819b7..277ecbc 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -578,6 +578,7 @@
 config ITCO_WDT
 	tristate "Intel TCO Timer/Watchdog"
 	depends on (X86 || IA64) && PCI
+	select WATCHDOG_CORE
 	select LPC_ICH
 	---help---
 	  Hardware driver for the intel TCO timer based watchdog devices.