arm: tegra: hawkeye: enable panel power saving suspend

arm: tegra: hawkeye: enable panel power saving suspend

Enable panel power saving suspend path, so that DSI lanes are powered
down when the panel is disabled.

Bug 1644469

Change-Id: Ifa9b533e4aeecfb41b085eb59c8e103316bb1760
Signed-off-by: Daniel Solomon <daniels@nvidia.com>
Reviewed-on: http://git-master/r/741028
(cherry picked from commit 029aa802db22c06aa6e0f933ab173a795a9a1dc8)
Reviewed-on: http://git-master/r/743968
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Tested-by: Mitch Luban <mluban@nvidia.com>