arm: remove prototype for arch_interrupt_init

Remove prototype for no more existing function

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/include/asm/u-boot-arm.h b/arch/arm/include/asm/u-boot-arm.h
index cc828c4..e08435a 100644
--- a/arch/arm/include/asm/u-boot-arm.h
+++ b/arch/arm/include/asm/u-boot-arm.h
@@ -39,7 +39,6 @@
 int	board_init(void);
 
 /* cpu/.../interrupt.c */
-int	arch_interrupt_init	(void);
 void	reset_timer_masked	(void);
 ulong	get_timer_masked	(void);
 void	udelay_masked		(unsigned long usec);