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This patch removes unused functions from the NVG driver.

* nvg_enable_power_perf_mode
* nvg_disable_power_perf_mode
* nvg_enable_power_saver_modes
* nvg_disable_power_saver_modes
* nvg_roc_clean_cache
* nvg_roc_flush_cache

Change-Id: I0387a40dec35686deaad623a8350de89acfe9393
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>