MIPS: kernel: Drop kgdb_call_nmi_hook

With the removal of set_fs() calls kgdb_call_nmi_hook() is now the same as
the default implementation, so we can remove it.

Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/kernel/kgdb.c

···
 		".set\treorder");
 }
 
-void kgdb_call_nmi_hook(void *ignored)
-{
-	kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
-}
-
 static int compute_signal(int tt)
 {
 	struct hard_trap_info *ht;