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Tegra210 SoCs need the sc7entry-fw to enter System Suspend mode,
but there might be certain boards that do not have this firmware
blob. To stop the NS world from issuing System suspend entry
commands on such devices, we ned to disable System Suspend from
the PSCI "features".

This patch removes the System suspend handler from the Tegra PSCI
ops, so that the framework will disable support for "System Suspend"
from the PSCI "features".

Original change by: kalyani chidambaram <kalyanic@nvidia.com>

Change-Id: Ie029f82f55990a8b3a6debb73e95e0e218bfd1f5
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>