qemu: do not enable IP7 blindly

IP7 will be enabled automatically in mips_clockevent_init(), if available.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/qemu/q-irq.c

@@ -33,5 +33,5 @@ void __init arch_init_irq(void)
 
 	mips_cpu_irq_init();
 	init_i8259_irqs();
-	set_c0_status(0x8400);
+	set_c0_status(0x400);
 }