memory: tegra20-emc: Use dev_pm_opp_set_clkname()

The dev_pm_opp_get_opp_table() shouldn't be used by drivers, use
dev_pm_opp_set_clkname() instead.

Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201111011456.7875-3-digetx@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>