opp: core: Add missing export to core.c

[Valdis Klētnieks]

After this commit, a 'make allmodconfig' fails due to a missing export.
commit 5f2430fb40c74db85764c8a472ecd6849025dd3f
Author: Sibi Sankar <si...@codeaurora.org>
Date:   Sat Jun 6 03:03:31 2020 +0530

    cpufreq: qcom: Update the bandwidth levels on frequency change

ERROR: modpost: "dev_pm_opp_adjust_voltage" 
[drivers/cpufreq/qcom-cpufreq-hw.ko] undefined!

Provide the export.

Fixes: 5f2430fb40c7 ("cpufreq: qcom: Update the bandwidth levels on frequency 
change")
Signed-off-by: Valdis Kletnieks <valdis.kletni...@vt.edu>

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 6937bf45f497..c9336aac74e9 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2302,6 +2302,7 @@ int dev_pm_opp_adjust_voltage(struct device *dev, 
unsigned long freq,
        dev_pm_opp_put_opp_table(opp_table);
        return r;
 }
+EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage);

 /**
  * dev_pm_opp_enable() - Enable a specific OPP

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