ARM: LPC32XX: Remove broken non-static declaration

This patch fixes a GCC compile error ("static declaration follows non-static
declaration") for LPC32XX's watchdog, removing the extern declaration since
it's not called externally.
Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Kevin Wells <kevin.wells@nxp.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-lpc32xx/common.h

@@ -65,7 +65,6 @@ extern u32 clk_get_pclk_div(void);
  */
 extern void lpc32xx_get_uid(u32 devid[4]);
 
-extern void lpc32xx_watchdog_reset(void);
 extern u32 lpc32xx_return_iram_size(void);
 
 /*