[MIPS] Fix typo in R3000 TRACE_IRQFLAGS code

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/genex.S

@@ -146,7 +146,7 @@ NESTED(handle_int, PT_SIZE, sp)
 	and	k0, ST0_IEP
 	bnez	k0, 1f
 
-	mfc0	k0, EP0_EPC
+	mfc0	k0, CP0_EPC
 	.set	noreorder
 	j	k0
 	rfe