openrisc: mask interrupts in irq_mask_ack function
openrisc: mask interrupts in irq_mask_ack function

or1k_pic_mask_ack was failing to actually mask the IRQ.

Signed-off-by: Gong Tao <8fbacf386c507dd4f600016cbda2b7c857f44d9a@gmail.com>
Signed-off-by: Jonas Bonn <35a2c6fae61f8077aab61faa4019722abf05093c@southpole.se>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas