regulator: gpio-regulator: Staticize of_get_gpio_regulator_config()

of_get_gpio_regulator_config() is only used in gpio-regulator.c, make it static.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
1 file changed