regulator: core: Fix exported symbols to the exported GPL version

regulator: core: Fix exported symbols to the exported GPL version

Change the exported symbols introduced by commit e9153311491da
("regulator: vctrl-regulator: Avoid deadlock getting and setting the voltage")
from EXPORT_SYMBOL() to EXPORT_SYMBOL_GPL(), like is used for all the core
parts.

Fixes: e9153311491da ("regulator: vctrl-regulator: Avoid deadlock getting and setting the voltage")
Reported-by: Dmitry Osipenko <[email protected]>
Signed-off-by: Enric Balletbo i Serra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>