watchdog: pnx4008: convert driver to use the watchdog framework

Make this driver a user of the watchdog framework and remove parts now handled
by the core. Tested on a custom lpc32xx-board.

[wim@iguana.be: Added set_timeout operation]
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index debbdb7..c83a83f 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -235,6 +235,7 @@
 config PNX4008_WATCHDOG
 	tristate "PNX4008 and LPC32XX Watchdog"
 	depends on ARCH_PNX4008 || ARCH_LPC32XX
+	select WATCHDOG_CORE
 	help
 	  Say Y here if to include support for the watchdog timer
 	  in the PNX4008 or LPC32XX processor.