ARM: remove unused do_unexp_fiq() function

do_unexp_fiq() has never been called by any code in the last 10 years,
it's about time it was removed!
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/traps.c

@@ -461,12 +461,6 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
 	arm_notify_die("Oops - undefined instruction", regs, &info, 0, 6);
 }
 
-asmlinkage void do_unexp_fiq (struct pt_regs *regs)
-{
-	printk("Hmm.  Unexpected FIQ received, but trying to continue\n");
-	printk("You may have a hardware problem...\n");
-}
-
 /*
  * Handle FIQ similarly to NMI on x86 systems.
  *