ARM: tegra: irq: add wake up handling

Add the wake up handling for legacy irq controller, and using
IRQCHIP_MASK_ON_SUSPEND for wake irq handling.

Based on the work by:
Varun Wadekar <vwadekar@nvidia.com>

Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>