video: tegra20: dsi: add reset support

Implement reset use to discard any changes which could have been
applied to DSI before and can interfere with current configuration.

Tested-by: Ion Agorria <ion@agorria.com> # HTC One X
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # Nvidia Tegratab T114
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
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