MX31: drop warnings due to missing prototype for mxc_watchdog_reset()

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/include/asm/arch-mx31/clock.h b/arch/arm/include/asm/arch-mx31/clock.h
index 1ff917e..9f7ae80 100644
--- a/arch/arm/include/asm/arch-mx31/clock.h
+++ b/arch/arm/include/asm/arch-mx31/clock.h
@@ -32,5 +32,6 @@
 void mx31_uart1_hw_init(void);
 void mx31_spi2_hw_init(void);
 void mxc_hw_watchdog_enable(void);
+void mxc_hw_watchdog_reset(void);
 
 #endif /* __ASM_ARCH_CLOCK_H */