ARM: tegra: allow 1-to-many irq to wake mapping

ARM: tegra: allow 1-to-many irq to wake mapping

Problem:
Current Tegra wake table does not allow same USB irq to be used
for multiple wake sources.

Fix:
Changed tegra_irq_to_wake API to return multiple wake table indices

bug 1286802

Change-Id: I72e6d83cb71de76e23ea9623b6fcae34091171bb
Signed-off-by: Bitan Biswas <bbiswas@nvidia.com>
Reviewed-on: http://git-master/r/231921
(cherry picked from commit b96d7c7db56bb49cd4f81190e25cf55b58794ab7)
Reviewed-on: http://git-master/r/241037
(cherry picked from commit 0e715b8054e22764e76c4f746287ba1c7c166501)
Reviewed-on: http://git-master/r/247134
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>