regulator: tps65023: Use [set|get]_voltage_sel_regmap instead of open coded

Simply the [get|set]_voltage_sel implementation by using
regulator_[set|get]_voltage_sel_regmap instead of open coded.

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