ARC: SMP send ipi to set ienable in case of not percpu.

Make ienable mask be symetric across CPUs.
This is needed since peripheral may be connected to any of the CPUs.
In case not connected to all CPUs peripheral may try to interrupt masked CPU.
Now setup_irq/request_irq unmask all CPUs not just the local CPU.

Signed-off-by: Noam Camus <noamc@ezchip.com>