Tegra210: SE: add context save support

Tegra210B01 SoCs support atomic context save for the two SE
hardware engines. Tegra210 SoCs have support for only one SE
engine and support a software based save/restore mechanism
instead.

This patch updates the SE driver to make this change.

Change-Id: Ia5e5ed75d0fe011f17809684bbc2ed2338925946
Signed-off-by: Harvey Hsieh <hhsieh@nvidia.com>
5 files changed