drm/msm/adreno: Remove a useless call to dev_pm_opp_get_freq()

Calling dev_pm_opp_find_freq_floor() returns the matched frequency
in 'freq'.  We don't need to call dev_pm_opp_get_freq() again
to get the frequency value.
Signed-off-by: NJordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: NRob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/adreno_device.c

@@ -248,7 +248,7 @@ static int adreno_get_pwrlevels(struct device *dev,
 	/* Find the fastest defined rate */
 	opp = dev_pm_opp_find_freq_floor(dev, &freq);
 	if (!IS_ERR(opp)) {
-		config->fast_rate = dev_pm_opp_get_freq(opp);
+		config->fast_rate = freq;
 		dev_pm_opp_put(opp);
 	}