[MIPS] Malta: Delete unused prototype of mips_timer_interrupt.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/mips-boards/malta/malta_int.c b/arch/mips/mips-boards/malta/malta_int.c
index 3842856..83d7602 100644
--- a/arch/mips/mips-boards/malta/malta_int.c
+++ b/arch/mips/mips-boards/malta/malta_int.c
@@ -42,8 +42,6 @@
 #include <asm/mips-boards/msc01_pci.h>
 #include <asm/msc01_ic.h>
 
-extern void mips_timer_interrupt(void);
-
 static DEFINE_SPINLOCK(mips_irq_lock);
 
 static inline int mips_pcibios_iack(void)