[MIPS] Remove set_c0_status(ST0_IM) from wrppmc's irq.c.

mips_cpu_irq_init() does clear_c0_status(ST0_IM) first, so
set_c0_status(ST0_IM) isn't necessary.
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/gt64120/wrppmc/irq.c

@@ -62,9 +62,6 @@ void gt64120_init_pic(void)
 
 void __init arch_init_irq(void)
 {
-	/* enable all CPU interrupt bits. */
-	set_c0_status(ST0_IM);	/* IE bit is still 0 */
-
 	/* IRQ 0 - 7 are for MIPS common irq_cpu controller */
 	mips_cpu_irq_init(0);